Abstract: A compound selected from the group consisting of a compound of the formula ##STR1## wherein R and R.sub.1 are --OH or --O-acyl of an organic carboxylic acid of 2 to 20 carbon atoms, R.sub.2 is hydrogen or methyl, R.sub.3 is --(CH.sub.2).sub.m --R.sub.4 or ##STR2## or --N--(CH.sub.2).sub.q --R.sub.4, m is an integer from 1 to 6, n, p and q are individually an integer from 0 to 6, A and B are individually selected from the group consisting of hydrogen, halogen and alkyl of 1 to 8 carbon atoms with the geometry of the double bond being E or Z or a mixture of E and Z or A and B form a triple bond, R.sub.4 is an optionally substituted mono- or polycyclic heterocycle and their non-toxic, pharmaceutically acceptable acid addition salts having antibiotic properties.

Abstract: Compounds of the formula ##STR1## wherein X and X' form C.dbd.O or C.dbd.NOR, R is selected from the group consisting of hydrogen, heterocycle, alkyl, alkenyl, alkynyl, all optionally substituted, ##STR2## R.sub.a and R.sub.b are hydrogen or a hydrocarbon group or form together with the nitrogen a heterocycle, or with A forms a 9-N, 11-O ring, and X' is hydrogen, --Y and Y' have the same definition as X and X', b is hydrogen or OR.sub.4, R.sub.4 is hydrogen or forms together with A a carbonate or a carbamate, A forms with C a double bond or A is OR'.sub.4, R'.sub.4 is hydrogen or forms together with B a carbonate or ##STR3## R.sub.2 is alkyl or --CONH.sub.2, --CONHCOR.sub.11 or --CONHSO.sub.2 R.sub.11, R.sub.11 is a hydrocarbon up to 18 carbon atoms, R.sub.3 is hydrogen, ##STR4## and Z is hydrogen or a carboxylic acid remainder and their non-toxic, pharmaceutically acceptable acid addition salts, their preparation and intermediates useful as antibiotics.

Abstract: A compound selected from the group consisting of a compound of the formula ##STR1## wherein X is selected from the group consisting of --(NH).sub.a --, --CH.sub.2 --, --SO.sub.2 -- and --O--, a is 0 or 1, Y is --(CH.sub.2).sub.m - (CH.dbd.CH).sub.n --(CH.sub.2).sub.o -, m+n+o.ltoreq.8, n=o or 1, Ar is aryl optionally substituted with at least one member of the group consisting of --OH, halogen, --NO.sub.2, --CN, ##STR2## and alkyl, alkenyl, alkynyl, alkoxy, alkenyloxy, alkynyloxy, alkylthio, alkenylthio, alkynylthio, -N-alkyl, -N-alkenyl and N-alkynyl of up to 12 carbon atoms, R.sub.a and R.sub.b individually are hydrogen or alkyl of up to 12 carbon atoms, R.sub.

Abstract: The syn isomer of a compound of the formula ##STR1## in the R or S form or a mixture of R and S forms wherein their non-toxic, pharmaceutically acceptable acid addition salts and having antibacterial activity and their preparation wherein the substituents are defined as in the specification.

Abstract: A compound selected from the group consisting of a compound of the formula ##STR1## wherein R is ##STR2## m and n are individually integers from 0 to 6, A and B are individually a member selected from the group consisting of hydrogen, halogen and alkyl of 1 to 8 carbon atoms, the double bond geometry being E or Z or E+Z or A and B form a third bond between the carbon atoms to which they are attached, Ar is selected from the group consisting of a) carbocyclic aryl of up to 18 carbon atoms optionally substituted with at least one member of the group consisting of free carboxy, alkoxycarbonyl, carboxy salified with a non-toxic, pharmaceutically acceptable base, amidified carboxy, --OH, halogen, --NO.sub.2, --CN, alkyl, alkenyl, alkynyl, alkoxy, alkenyloxy, alkynyloxy, alkylthio, alkenylthio and alkynylthio of up to 12 carbon atoms, N-alkyl, N-alkenyl and N-alkynyl of up to 12 carbon atoms and cycloalkyl of 3 to 12 carbon atoms, all optionally substituted with at least one halogen and ##STR3## R.sub.1 and R.sub.