Ethyl Green
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The dye Ethyl Green (Brilliant Green, C.I. 42590; C27H35N3ClBr), due to its powerful bacteriostatic properties, is commonly used along with iodine tincture as a topical antiseptic in Eastern Europe / the former USSR (common name: Zelyonka / Зелёнка), though not in the west due to its irritant properties and toxicity if ingested. It is soluble in water.
Its CAS number is [7114-03-6] [1] and its SMILES structure is C/[N+](C)=C (C=C3)/C=C\C3=C (C2=CC=C([N+](C) (CC)C)C=C2)/C1=C C=C(N(C)C)C=C1.
Ethyl green is made of crystal violet by adding an ethyl group; crystal violet is therefore a possible contaminant.
Methyl green is a closely related dye used as a stain in histology. Methyl green and ethyl green are very similar and probably interchangeable.
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