(1R-(1alpha,4alpha,13R*(S*)))-1',9'a-Dihydro-1-methylspiro(1,4-ethano-2H-pyrazino(2,1-b)quinazoline-13,9'-(9H)imidazo(1,2-a)indole)-3,3',6(1H,2'H,4H)-trione 1',9'a-Dihydro-1-methylspiro(1,4-ethano-2H-pyrazino(2,1-b)quinazoline-13,9'-(9H)imidazo(1,2-a)indole)-3,3',6(1H,2'H,4H)-trione (1R-(1alpha,4alpha,13R*(S*)))- 157075-58-6 Spiro(1,4-ethano-2H-pyrazino(2,1-b)quinazoline-13,9'-(9H)imidazo(1,2-alpha)indole)-3,3',6(1H,2'H,4H)-trione, 1',9'a-dihydro-1-methyl- (1R-(1alpha,4alpha,13R*(S*)))- Spiroquinazoline