ethyl 5-cyano-4-methyl-6-oxo-1H-pyridine-2-carboxylate

2',3'-二氢-7'-甲基-5'-氧代-螺[1,3-二氧戊环-2,1'(5'H)-吲嗪]-6'-甲腈

4-ethyl-1,12-dihydro-14H-pyrano[3',4':6,7]indolizino[1,2-b]quinoline-3,14(4H)-dione

1,12-dihydro-4H-pyrano[3',4':6,7]indolizino[1,2-b]quinoline-3,14-dione