[ 실시 예 65 ] Dimethyl 4 , 8 - dimethyl - 2 -( methylsulfonyl ) - 4 a , 5 - dihydro - 8 H - pyrido [ 1 ', 2 ': 4 , 5 ] [ 1 , 4 ] diaze - pino [ 2 , 3 - b ] indole - 5 , 6 - dicarboxylate ( 화합물 1 - 1 g ) 의 제조