N-(2-Chloroethylaminoethyl)-4-chloro-L-proline ethyl ester dihydrochloride Proline, 4-chloro-1-(2-((2-chloroethyl)amino)ethyl)-, ethyl ester, dihydrochloride, L- TW3590000 trans-4-Chloro-1-(2-((2-chloroethyl)amino)ethyl)proline ethyl ester dihydrochloride