10-acetoxy-20-acetyl-7-(2-trimethylsilylethynyl)camptothecin

(S)-4-ethyl-4-hydroxy-6-iodo-3-oxo-1H-pyrano[3,4-c]-8-pyridone

(S)-4-ethyl-4-hydroxy-6-iodo-8-methoxy-1,4-dihydro-pyrano[3,4-c]pyridin-3-one

1-溴-2-戊炔

(S)-4-Ethyl-4-hydroxy-6-iodo-3-oxo-7-(2-pentynyl)-1H-pyrano[3,4-c]-8-pyridone