Molecular Formula: C₁₉H₁₂O₆S

Chemical Name
1,1-dioxo-1λ6-spiro[benz[c][1,2]oxathiol-3,9'-xanthene]-3',6'-diol
1,1-Dioxo-1λ6-spiro[benz[c][1,2]oxathiol-3,9'-xanthen]-3',6'-diol
spiro[3H-2,1-benzoxathiole-3,9'-[9H]xanthene]-3',6'-diol 1,1-dioxide
sulfonefluorescein

Molecular Formula: C₂₂H₁₆O₅

Chemical Name
3',6'-Dihydroxy-4',5'-dimethyl-spiro[phthalan-1,9'-xanthen]-3-on
3',6'-dihydroxy-4',5'-dimethyl-spiro[phthalan-1,9'-xanthen]-3-one
4',5'-dimethylfluorescein
4,5-dimethylfluorescein

Molecular Formula: C₁₉H₁₂O₆S

Chemical Name
1,1-dioxo-1λ6-spiro[benz[c][1,2]oxathiol-3,9'-xanthene]-2',7'-diol
1,1-Dioxo-1λ6-spiro[benz[c][1,2]oxathiol-3,9'-xanthen]-2',7'-diol
hydroquinonesulfonefluorescein

Molecular Formula: C₂₀H₁₂O₇

Chemical Name
(4,5,6-trihydroxy-3-oxo-3H-xanthen-9-yl)benzoic acid
3',4',5',6'-Tetrahydroxy-spiro[phthalan-1,9'-xanthen]-3-on
3',4',5',6'-tetrahydroxy-spiro[phthalan-1,9'-xanthen]-3-one
3',4',5',6'-tetrahydroxyspiro(isobenzofuran-1(3H),9'-[9H]xanthene)-3-one
4',5'-dihydroxyfluorescein
ALIZARIN VIOLET
gallein

Molecular Formula: C₂₀H₁₁NO₇

Chemical Name
3',6'-Dihydroxy-6-nitro-spiro[phthalan-1,9'-xanthen]-3-on
3',6'-dihydroxy-6-nitro-spiro[phthalan-1,9'-xanthen]-3-one
3',6'-dihydroxy-6-nitrospiro[2-benzofuran-3,9'-xanthene]-1-one
4'-nitrofluorescein
5-Nitro-fluorescein
5-nitrofluorescein
6-nitrofluorescein

Molecular Formula: C₂₀H₁₁NO₇

Chemical Name
3',6'-Dihydroxy-5-nitro-spiro[phthalan-1,9'-xanthen]-3-on
3',6'-dihydroxy-5-nitro-spiro[phthalan-1,9'-xanthen]-3-one
3',6'-dihydroxy-5-nitrospiro[2-benzofuran-3,9'-xanthene]-1-one
3',6'-dihydroxy-5-nitrospiro[isobenzofuran-1(3H),9'-[9H]xanthen]-3-one
4-nitrofluorescein
5'-nitrofluorescein
5-nitrofluorescein

Molecular Formula: C₁₉H₁₂O₈S

Chemical Name
1,1-dioxo-1λ6-spiro[benz[c][1,2]oxathiol-3,9'-xanthene]-3',4',5',6'-tetraol
1,1-Dioxo-1λ6-spiro[benz[c][1,2]oxathiol-3,9'-xanthen]-3',4',5',6'-tetraol
pyrogallol red
pyrogallolred
pyrogallolsulfonephthalein
spiro[3H-2,1-benzoxathiole-3,9'-[9H]xanthene]-3',4',5',6'-tetrol 1,1-dioxide

Molecular Formula: C₂₀H₁₂O₅

Chemical Name
2-(6-hydroxy-3-oxoisoxanthen-9-yl)benzoic acid
3',6'-dihydroxyspiro[isobenzofuran-1(3H),9'(9H)-xanthen]-3-one
FL
FLC
fluorescein
uranine
[Fluorescein]-Fluorescein

Molecular Formula: C₁₉H₁₄O₅S

Chemical Name
3,3-bis(4-hydroxybenzoxathiole)-1,1-dioxide
3,3-bis(4-hydroxyphenyl)-3H-2,1λ6-benzoxathiole 1,1-dioxide
3,3-bis-(4-hydroxy-phenyl)-3H-benz[c][1,2]oxathiol-1,1-dioxide
Phenol red
phenolsulfonephthalein

Molecular Formula: C₂₁H₁₈O₅S

Chemical Name
3,3-bis(4-hydroxy-2-methylphenyl)-3H-2,1λ6-benzoxathiole-1,1-dioxide
3,3-bis(4-hydroxy-3-methylphenyl)-3H-2,1λ6-benzoxathiole 1,1-dioxide
CR
Cresol Red
m-cresol red
o-Cresol Red
o-cresolsulphophthalein

Molecular Formula: C₂₁H₁₈O₅S

Chemical Name
3,3-bis(4-hydroxy-2-methylphenyl)-3H-2,1λ6-benzoxathiole 1,1-dioxide
3,3-bis(4-hydroxy-3-methylphenyl)-3H-2,1,λ6-benzoxathiole-1,1-dioxide
3,3-Bis-(4-hydroxy-2-methyl-phenyl)-3H-benz[c][1,2]oxathiol-1,1-dioxid
3,3-bis-(4-hydroxy-2-methyl-phenyl)-3H-benz[c][1,2]oxathiol-1,1-dioxide
cresol purple
cresolsulfonphthalein
m-Cresol Purple

Molecular Formula: C₂₃H₂₂O₅S

Chemical Name
2,6-Xylenosulfonephthalein
3,3-bis(4-hydroxy-3,5-dimethylphenyl)-3H-2,1λ6-benzoxathiole 1,1-dioxide
3,3-Bis-(4-hydroxy-3,5-dimethyl-phenyl)-3H-benz[c][1,2]oxathiol-1,1-dioxid
3,3-bis-(4-hydroxy-3,5-dimethyl-phenyl)-3H-benz[c][1,2]oxathiol-1,1-dioxide
p-Xylenolol blue

Molecular Formula: C₁₉H₁₄O₇S

Chemical Name
3,3-bis(3,4-dihydroxyphenyl)-3H-2,1λ6-benzoxathiole 1,1-dioxide
3,3-Bis-(3,4-dihydroxy-phenyl)-3H-benz[c][1,2]oxathiol-1,1-dioxid
3,3-bis-(3,4-dihydroxy-phenyl)-3H-benz[c][1,2]oxathiol-1,1-dioxide
Brenzcatechinviolett
pyrocatechol
Pyrocatechol Violet

Molecular Formula: C₂₃H₂₂O₅S

Chemical Name
3,3-bis(4-hydroxy-2,5-dimethylphenyl)-3H-2,1λ6-benzoxathiole 1,1-dioxide
3,3-bis(4-hydroxy-2,5-dimethylphenyl)-3H-2,1λ6-benzoxathiole-1,1-dioxide
3,3-Bis-(4-hydroxy-2,5-dimethyl-phenyl)-3H-benz[c][1,2]oxathiol-1,1-dioxid
3,3-bis-(4-hydroxy-2,5-dimethyl-phenyl)-3H-benz[c][1,2]oxathiol-1,1-dioxide
4,4'-(3H-2,1-benzoxathiol-3-ylidene)bis[2,5-dimethylphenol] S,S-dioxide
p-Xylenol Blue
xylenol blue

Molecular Formula: C₂₁H₁₆O₆S

Chemical Name
methylsulfonefluorescein

Molecular Formula: C₂₇H₃₀O₅S

Chemical Name
3,3-bis(4-hydroxy-5-isopropyl-2-methylphenyl)-3H-2,1λ6-benzoxathiole 1,1-dioxide
Thymol Blue

Molecular Formula: C₃₁H₂₂O₅S

Chemical Name
2-phenylphenolsulfonephthalein
3,3-bis(4-hydroxy-3-phenylphenyl)-3H-2,1λ6-benzoxathiole 1,1-dioxide

Molecular Formula: C₂₇H₁₆O₆S

Chemical Name
naphthosulfonefluorescein