|4672033||Antibiotics X-14889 A,C and D|
There is presented antibiotic compounds designated as Antibiotics X-14889 A, C and D of the formulas ##STR1## wherein (for X-14889A) R1 is methyl, R2 is methyl, R3 is hydrogen, R4 is methyl and R5
|4581360||Sparsomycin (Sc -Rs) derivative; pharmaceutical composition having anti-tumor activity|
The invention concerns novel sparsomycin (Sc -Rs) derivatives having superior cytostatic activity compared to sparsomycin itself. Said derivatives contain a lipophilic group R2, selected from C2 -C20 ...