135521-74-3 2-Amino-9-chloro-4-phenyl-4H,5H-(1)benzothiopyrano(4,3-b)pyran-3-carbonitrile 4H,5H-(1)Benzothiopyrano(4,3-b)pyran-3-carbonitrile, 2-amino-9-chloro-4-phenyl- BRN 4268075