system,20 corresponding to carbon signals characteristic of an
acrylate double bond at δC 158.5 (C-2) and 98.6 (C-16). The 1
H NMR spectrum displayed two olefinic signals at δH 5.80
(ddd, J = 10.2, 4.8, 1.2 Hz) and 5.62 (d, J = 10.2 Hz), which
were ascribed to protons of a double bond between C-14 and
C-15. An indolic −NH proton was also observed at δH 9.32
(1H, s) (Table 1). The 13C NMR and DEPT spectra of
system,20 corresponding to carbon signals characteristic of anacrylate double bond at δC 158.5 (C-2) and 98.6 (C-16). The 1H NMR spectrum displayed two olefinic signals at δH 5.80(ddd, J = 10.2, 4.8, 1.2 Hz) and 5.62 (d, J = 10.2 Hz), whichwere ascribed to protons of a double bond between C-14 andC-15. An indolic −NH proton was also observed at δH 9.32(1H, s) (Table 1). The 13C NMR and DEPT spectra of
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