Name：5-(1H-Indol-3-yl)-2-mercapto-pentanoic acid

C13H15NO2S

Exact Mass: 249.08
Mol. Wt.: 249.33
m/e: 249.08 (100.0%), 250.09 (14.8%), 251.08 (4.5%), 251.09 (1.5%), 250.08 (1.2%)
C, 62.62; H, 6.06; N, 5.62; O, 12.83; S, 12.86

下面4种结构可任选一个，哪个好做合成哪个