1,3-Diphenyl-1,3a,4,9b-tetrahydrochromeno[4,3-c]pyrazol-8-yl methyl ether 8-Methoxy-1,3-diphenyl-1,3a,4,9b-tetrahydrochromeno[4,3-c]pyrazole AIDS-138894 AIDS138894 NSC646492