Patent ID: RE39723

Claim:
A compound of formula: wherein R and R 1 are each independently hydrogen, a C 1 -C 18 acyl group, an aroyl group which may be substituted or unsubstituted, or —CONR 6 R 7 ; R 2 is hydrogen or R 2 forms a carbonate or thiocarbonate with R 3 ; R 3 is hydrogen, hydrogen or —OH, or R 3 forms a carbonate or thiocarbonate with R 2 ; R 4 is a benzoyl group which is unsubstituted or substituted at the meta position or a hetaroyl group; R 6 and R 7 are a C 1 -C 4 alkyl group, a benzyl group, or a phenyl group; R 1 R′ is hydrogen or a C 1 -C 4 alkyl group; R 11 R″ is a C 1 -C 4 alkyl group, a C 2 -C 6 alkenyl group, an aryl group, or a hetaryl group; and R 111 R′″ is a C 1 -C 4 alkyl group, a C 1 -C 18 acyl group, an aryl group, or a tert-butoxy group, with the proviso that both R and R 1 cannot be hydrogen.