Animal growth promoting agents.

摘要

The invention relates to compositions comprising one or more of the following compounds designated WS-1627A, WS-1627B, WS-1627C and WS-1627D, or salts thereof:
<CHEM>
wherein R1 =COCH3 and R2=H in WS-1627A (KA-393)
and R1 = H and R2=COCH3 in WS-1627C
<CHEM>
wherein R1-COCH3 and R2=H in WS-1627B (Hygromycin)
and R1=H and R2=COCH3 in WS-1627D (Epi-hygromycin)
WS-1627A, WS-1627B and WS-1627D are in fact known antibiotics, but WS-1627C is a new epimer of the antibiotic KA-3093.
<??>The compositions are useful both for preventing or treating swine dysentery and as animal growth promotants.
<??>There is also provided a process for preparing WS-1672A,