Indigo carmine

from source

C16H8N2Na2O8S2 · 466.4 g/mol

indigotine

What is Indigo carmine?

Blue 2, made by sulfonating natural indigo. It colours some candies and is used medically as a dye to trace fluid in surgery. from source

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Fig. 1 · 2D structure RDKit

SMILESC1=CC2=C(C=C1S(=O)(=O)[O-])C(=O)/C(=C\3/C(=O)C4=…91 characters