The IR
absorption at 1680 cm-1 and a signal at ä 153.4 in the 13C
NMR spectrum suggested the presence of a carbamate
moiety.20 The EIMS spectrum showed that one chlorine is
present in alkaloid 2 with a 3-to-1 ratio at m/z (rel int %):
433 (65, M+)/435; 397 (85, [M - HCl]+); 345 (100)/347. The
molecular ion was seen at m/z 433 (65, M+)/435, and the
base peak was at m/z 345 (100)/347 due to loss of (CH2-
N-COOCH3 + H) from the molecular ion.