Cholest-5-en-3-ol (3β)-, 3,3′-(7,7a,9,10,18,19-hexahydro-18-hydroxy-16,19-dioxo-6H,8H-pyrrolo[1,2-a]quino[1′′,2′′:1′,2′]pyrrolo[3′,2′:4,5]furo[3,2-b]quinoline-16a(16),18-dicarboxylate)