1H), 3.21 (d, J 5 8.0 Hz, 1H), 4.60 (dd, J 5 4.8, 8.5 Hz, 1H), 5.53 (m, 2H),
6.67 (d, J 5 8.5 Hz, 2H), 7.02 (d, J 5 8.5 Hz, 2H); 13C NMR (125 MHz,
CD3OD) d 14.4, 23.7, 24.8, 24.9, 29.8, 29.9, 30.0, 30.2, 30.3, 32.9, 33.5, 37.5,
43.1, 43.5 (2), 55.1, 57.7, 80.0, 116.2 (2), 124.5, 128.7, 131.4 (2), 137.6, 157.4,
173.6, 173.9, 174.5, 175.8, 214.6; FTIR (neat) 3748, 3656, 3363, 1712, 1523,
1454, 1232 cm21; MS (EI) m/z 164 (100), 465, 511 [(M 2 2H2O 2 CO2)+];
HRMS (EI) calcd for C30H41NO6 [(M 2 2H2O 2 CO2)+] 511.2934, found
511.2922; HRMS (FAB, NBA) calcd for C31H46NO10 [(M + H)+] 592.3121,
found 592.3110.
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