were observed in the NOESY spectrum (Figure 1),
confirming the positions of the methoxy groups. Thus, the
structure of 3 was determined as illustrated and named
romucosine G (3). Treatment of (+)-norpurpureine with
triethylamine and methyl chlorocarbonate gave a compound
whose mp, UV, TLC, and 1H NMR data were the
same as those of 3.