135521-73-2 2-Amino-4-(1,1'-biphenyl)-4-yl-4H,5H-(1)benzothiopyrano(4,3-b)pyran-3-carbonitrile 4H,5H-(1)Benzothiopyrano(4,3-b)pyran-3-carbonitrile, 2-amino-4-(1,1'-biphenyl)-4-yl- BRN 4273295