CAS # 482-89-3, Indigo, 2-(1,3-Dihydro-3-oxo-2H-indol-2-ylidene)-1,2-dihydro-3H-indol-3-one, 2,2'-Bis(2,3-dihydro-3-oxoindolylidene), Indigo blue, C.I. 73000, Vat Blue 1

Identification
Name	Indigo
Synonyms	2-(1,3-Dihydro-3-oxo-2H-indol-2-ylidene)-1,2-dihydro-3H-indol-3-one; 2,2'-Bis(2,3-dihydro-3-oxoindolylidene); Indigo blue; C.I. 73000; Vat Blue 1

Molecular Structure
Molecular Formula	C₁₆H₁₀N₂O₂
Molecular Weight	262.27
CAS Registry Number	482-89-3
EINECS	207-586-9

Properties
Melting point	390-392 ºC (dec.)
Water solubility	<0.1 g/100 mL

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Indigo[CAS# 482-89-3]