Methyl 2'-amino-7'-methyl-2,5'-dioxo-1,2-dihydro-5'H-spiro[indole-3,4'-pyrano[3,2-c]pyran]-3'-carboxylate 1g

Methyl 2'-amino-7'-methyl-2,5'-dioxo-1,2-dihydro-5'H-spiro[indole-3,4'-pyrano[3,2-c]pyran]-3'-carboxylate 1g