(1′S,4aR,5S,11aS,12′S)-1,2,3,11a-Tetrahydro-3′H,11H,15′H-spiro[pyrrolo[1′,2′:3,4]imidazo[1,2-a]indole-5,13′-[2,10,16]triazatetracyclo[10.2.2.0~2,11~.0~4,9~]hexadeca[4,6,8,10]tetraene]-3′,11,15′-trione trihydrate