Normavacurine-21-one (1): white powder; [α]21 D −137.9 (c 0.1,
MeOH); UV (MeOH) λmax (log ε) 219.5 (4.39), 271.0 (3.68); IR (KBr)
νmax 3441 cm−1
, 1632 cm−1
, 1562 cm−1
, 1452 cm−1
; 1
H and 13C NMR
data see Table 1; positive ESIMS m/z 309 [M + H]+; positive HRESIMS
m/z 309.1596 (calcd for C19H21N2O2 [M + H]+, 309.1603).