isolated as a colorless, amorphous solid with
the molecular formula C48H51NO18, showed sets of 1Hand 13C
NMR signals similar to those of 4. The 1H NMR spectrum of 5
showed only four acetyl signals, but had aromatic proton signals
characteristic of two benzoyl groups. Long-range HMBC
correlations of H-1 (δH 6.50)/C-7000 (δC 164.9) and of H-5
(δH 7.03)/C-700 (δC 164.9) indicated connections of one O-Bzgroup to C-1 and the second group to C-5. Complete assignments
of 1H and 13C NMR chemical shifts are shown in the
Experimental Section and Table 1. Compound 5 was thus 1-Obenzoyl-
1-deacetyl-90-deacetoxymekongensine.