134017-78-0 Guanidine, N-cyano-N'-(6-cyano-3,4-dihydro-3-hydroxy-2,2-dimethyl-2H-1-benzopyran-4-yl)-N''-(1,1-dimethylpropyl)-, U 89232 U-89232 trans-N-Cyano-N'-(6-cyano-3,4-dihydro-3-hydroxy-2,2-dimethyl-2H-1-benzopyran-4-yl)-N''-(1,1-dimethylpropyl)guanidine