| abstract |
ABSTRACT Compounds of the formula wherein R1 is hydrogen, an optionally substituted aromatic hydrocarbon radical, an aralkyl radical or an optionally substituted aliphatic hydrocarbon radical having up to 45 C atoms, R2 is an optionally substituted aromatic hydrocarbon radical, an aralkyl radical or an optionally sub-stituted aliphatic hydrocarbon radical having 5-50 C atoms, X is 0, S. NH or NR, R being an alkyl radical having up to 20 C atoms, and Z is a glycosyl radical bonded via the anormeric carbon atom, or pharmaceutically acceptable salts thereof stimulate the immune system. |