135521-72-1 2-Amino-4-(4-hydroxy-3-methoxyphenyl)-4H,5H-(1)benzothiopyrano(4,3-b)pyran-3-carbonitrile 4H,5H-(1)Benzothiopyrano(4,3-b)pyran-3-carbonitrile, 2-amino-4-(4-hydroxy-3-methoxyphenyl)- BRN 4274030