American Cyanamid Company

Brian M Bain

David Noble

Richard A Fletton

Derek R Sutherland

Neil Porter

John B Ward

Hazel M Noble

Michael V Ramsay

Edward P Tiley

Peter D Howes

Michael V Ramsey

Paul F Lambeth

Alison C Rosemeyer

Compounds of formula (I) ##STR1## and salts thereof wherein R.sup.1 is a methyl, ethyl or isopropyl group;

Macrolide compounds

Compounds are described of formula (I) ##STR1## and salts thereof, wherein R.sup.1 represents a methyl, ethyl or isopropyl group; and

Antibiotic compounds and method of use

Compounds of formula (I): ##STR1## and salts thereof; wherein R.sup.1 is --H, --OH or substituted --OH and R.sup.2 is --H, or R.sup.1 and R.sup.2 together with the carbon atom to which they are attached represent C.dbd.O, C.dbd.CH.sub.2 or C.dbd.NOR.sup.6 in the E configuration (where R.sup.6 is --H, alkyl or alkenyl);

Macrolid compounds

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Tylers Green, United Kingdom

Brian M Bain