2-((2,4-Diaminopyridin-6-yl)azo)-3-cyano-4-methyl-5-(methoxycarbonyl)thiophene 2-Thiophenecarboxylic acid, 4-cyano-5-((4,6-diamino-2-pyridinyl)azo)-3-methyl-, methyl ester 72121-80-3