Fluorescein
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Description

Fluorescein (lactone form) is a xanthene dye that is highly fluorescent, detectable even when present in minute quantities. Used forensically to detect traces of blood, in analytical chemistry as an indicator in silver nitrate titrations and in microscopy. It has a role as a radioopaque medium and a fluorescent dye. It is a polyphenol, a gamma-lactone, a xanthene dye, an oxaspiro compound, an organic heteropentacyclic compound and a member of 2-benzofurans. It is functionally related to a fluorescein (acid form).

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Source creator
Michael Beck
Source license
CC-BY
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#nih-3d
#small molecules
#fluorescein
#2321-07-5
#solvent yellow 94
#resorcinolphthalein
#fluoresceine
#yellow fluorescein
#3',6'-dihydroxy-3h-spiro[isobenzofuran-1,9'-xanthen]-3-one
#3,6-fluorandiol
#d and c yellow no. 7
#d&c yellow no. 7
#japan yellow 201
#c.i. solvent yellow 94
#3',6'-dihydroxyfluoran
#fluoreszein
#fluorescein acid
#soap yellow f
#hidacid fluorescein
#d & c yellow no. 7
#fluorescein red
#d+c yellow no. 7
#11712 yellow
#chebi:31624
#japan yellow no. 201
#zlut kysela 73
#resorcinol phthalein
#9-(o-carboxyphenyl)-6-hydroxy-3-isoxanthenone
#9-(o-carboxyphenyl)-6-hydroxy-3h-xanthen-3-one
#3',6'-fluorandiol
#fluoran, 3',6'-dihydroxy-
#nsc 667256
#fluorescein (free acid)
#dihydroxyfluorane
#tpy09g7xir
#3',6'-dihydroxyspiro[2-benzofuran-3,9'-xanthene]-1-one
#diresorcinolphthalein
#c.i. 45350:1
#ccris 7076
#dtxsid0038887
#hsdb 2128
#spiro[isobenzofuran-1(3h),9'-[9h]xanthen]-3-one, 3',6'-dihydroxy-
#ci 45350:1
#einecs 219-031-8
#unii-tpy09g7xir
#mfcd00005050
#nsc-667256
#nsc-759114
#3h-xanthen-3-one, 9-(o-carboxyphenyl)-6-hydroxy-
#brn 0094324
#chembl1057
#ki201
#dtxcid8018887
#3,6-dihydroxyspiro(xanthene-9,3'-phthalide)
#3',6'-dihydroxyspiro(isobenzofuran-1(3h),9'(9h)-xanthen)-3-one
#nsc667256
#benzoic acid, o-(6-hydroxy-3-oxo-3h-xanthen-9-yl)-
#benzoic acid, 2-(6-hydroxy-3-oxo-3h-xanthen-9-yl)-
#ncgc00161643-03
#d & c yellow no. 7 k7133
#3',6'-dihydroxy-3h-spiro[2-benzofuran-1,9'-xanthen]-3-one
#fluorescein (ii)
#fluorescein [ii]
#3',6'-dihydroxyspiro(isobenzofuran-1(3h),9'-(9h)xanthen)-3-one
#spiro(isobenzofuran-1(3h),9'-(9h)xanthen)-3-one, 3',6'-dihydroxy-
#ec 219-031-8
#fluorescein (mart.)
#fluorescein [mart.]
#fluorescein (usp-rs)
#fluorescein [usp-rs]
#5-19-06-00456 (beilstein handbook reference)
#diofluor
#fluorescein (ep monograph)
#fluorescein [ep monograph]
#fluorescein (usp monograph)
#fluorescein [usp monograph]
#cas-2321-07-5
#3,6-dihydroxyspiro[xanthene-9,3'-phthalide]
#c20h12o5
#zlut kysela 73 [czech]
#fluoresceina
#3',6'-dihydroxy-3h-spiro(2-benzofuran-1,9'-xanthen)-3-one
#fluorescein lactone
#fluorescite (tn)
#d&c yellow no 7
#fluorescite (salt/mix)
#3',6' dihydroxyfluoran
#fluorescein (jan/usp)
#fluorescein [mi]
#3',4'-dehydroxyfluoran
#fluorescein [jan]
#3',6'-dihydroxyfluorane
#fluorescein (lactone form)
#fluorescein [hsdb]
#epitope id:137337
#upcmld-dp087
#yellow 7 [inci]
#fluorescein [vandf]
#schembl16533
#fluorescein [who-dd]
#fluorescein [usp:ban:jan]
#ki201 [inci]
#upcmld-dp087:001
#acid yellow 73 [inci]
#gnbhrkfjiuuoqi-uhfffaoysa-
#c.i. 45350 (free acid)
#fluorescein (solvent yellow 94)
#c.i. 45350 (salt/mix)
#hms2093f21
#hms3744c17
#moli001003
#pharmakon1600-01505396
#amy22388
#hy-d0251
#tox21_113500
#tox21_303508
#bdbm50237588
#c.i. acid yellow 73 (salt/mix)
#nsc759114
#s5488
#spiro(isobenzofuran-1(3h),9'-(9h)xanthen)-3-one,3'6'-dihydroxy-
#akos015903296
#ccg-213417
#cs-7537
#db00693
#c.i. 45350a
#fluorescein, for fluorescence, free acid
#ncgc00161643-01
#ncgc00161643-02
#ncgc00257491-01
#bp-31220
#sy012645
#sbi-0206827.p001
#f0095
#fluorescein (free acid), dye content 95 %
#ft-0668579
#d01261
#d70685
#en300-702817
#ab00643381_02
#q410922
#sr-05000001696
#sr-05000001696-1
#w-107417
#brd-k21913543-001-01-6
#benzoic acid, 2-(6-hydroxy-3-oxo-3h-xanthen-9-yl)-,
#benzoic acid, o-(6-hydroxy-3-oxo-3h-xanthen-9-yl)-,
#3',6'-dihydroxyspiro[isobenzofuran-3,9'-xanthene]-1-one
#e89fa0b4-4844-46a2-af9b-29eca50e5599
#fluorescein, european pharmacopoeia (ep) reference standard
#o-(6-hydroxy-3-oxo-3h-xanthen-9-yl)benzoic acid
#3',6'-dihydroxy-3h-spiro[isobenzo[b]furan-1,9'-xanthen]-3-one
#3',6'-dihydroxyspiro(isobenzofuran-1(3h), 9'(9h)-xanthen)-3-one
#fluorescein, united states pharmacopeia (usp) reference standard
#11712 yellow9-(o-carboxyphenyl)-6-hydroxy-3h-xanthen-3-one
#spiro(isobenzofuran-1(3h),9'-(9h)xanthen-3-one, 3',6'-dihydroxy-
#fluorescein low range dna standard, fluorescein-labeled marker for dna electrophoresis
#spiro[isobenzofuran-1(3h),9'-[9h]xanthene]-ar-carboxylicacid, 3',6'-dihydroxy-3-oxo-
#inchi=1/c20h12o5/c21-11-5-7-15-17(9-11)24-18-10-12(22)6-8-16(18)20(15)14-4-2-1-3-13(14)19(23)25-20/h1-10,21-22h
#yellow 7
#3mf
#blend
#fbx
#glb
#jpg
#mtl
#obj
#ply
#png
#stl
#wrl
#x3d

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Fluorescein

From NIH 3D
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Category

learning

License

CC-BY

Published

8/29/2026

Availability

free on NIH 3D