5',6',7',8'-Tetrahydrodispiro(cyclohexane-1,2'(3'H)-quinazoline-4',1''(4a'H)-cyclohexane), 5',6',7',8'-tetrahydro-4a'h-dispiro[cyclohexane-1,2'-quinazoline-4',1''-cyclohexane], Dispiro(cyclohexane-1,2'(3'H)-quinazoline-4'(4'aH),1''-cyclohexane),5',6',7',8'-tetrahydro
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