Synonyms: 1H,5H-furo[3,4-c]furo[3',4':4,5]pyrazolo[1,2-a]pyrazole-1,3,6,8(3aH)-tetrone, tetrahydro-5,10-diphenyl-;5,10-Diphenyltetrahydro-1H,5H-furo(3,4-c)furo(3',4':4,5)pyrazolo(1,2-a)pyrazole-1,3,6,8(3aH)-tetrone;5,10-Diphenyltetrahydro-1H,5H-furo[3,4-c]furo[3',4':4,5]pyrazolo[1,2-a]pyrazole-1,3,6,8(3aH)-tetrone