1-[3-(1′-Hydroxy-2′,2′-dimethyl-3′,5-dioxo-1′,2′,3′,4,5,9a′-hexahydro-3H-spiro[furan-2,9′-imidazo[1,2-a]indol]-4-yl)-4-oxo-3,4-dihydro-2-quinazolinyl]-2-methylpropyl acetate

1-[3-(1′-Hydroxy-2′,2′-dimethyl-3′,5-dioxo-1′,2′,3′,4,5,9a′-hexahydro-3H-spiro[furan-2,9′-imidazo[1,2-a]indol]-4-yl)-4-oxo-3,4-dihydro-2-quinazolinyl]-2-methylpropyl acetate

Spiro[furan-2(5H),9′-[9H]imidazo[1,2-a]indole]-3′,5(2′H)-dione, 4-[2-[1-(acetyloxy)-2-methylpropyl]-4-oxo-3(4H)-quinazolinyl]-1′,3,4,9′a-tetrahydro-1′-hydroxy-2′,2′-dimethyl-

acetic acid [1-[3-(3-hydroxy-1,2′-diketo-2,2-dimethyl-spiro[3aH-imidaz[1,2-a]indole-4,5′-tetrahydrofuran]-3′-yl)-4-keto-quinazolin-2-yl]-2-methyl-propyl] ester