(3S,6R,7S)-N'-hydroxy-N-(2-methylamino-2-oxoethyl)-6-(2-methylpropyl)-5-oxo-11-oxa-4-azabicyclo[10.2.2]hexadeca-1(15),12(16),13-triene-3,7-dicarboxamide
(3S,6R,7S)-7-(hydroxycarbamoyl)-6-isobutyl-N-(2-methylamino-2-oxo-ethyl)-5-oxo-11-oxa-4-azabicyclo[10.2.2]hexadeca-1(15),12(16),13-triene-3-carboxamide
(3S,6R,7S)-7-[(hydroxyamino)-oxomethyl]-6-isobutyl-N-(2-methylamino-2-oxoethyl)-5-oxo-11-oxa-4-azabicyclo[10.2.2]hexadeca-1(15),12(16),13-triene-3-carboxamide
(3S,6R,7S)-7-(hydroxycarbamoyl)-6-isobutyl-5-keto-N-(2-keto-2-methylamino-ethyl)-11-oxa-4-azabicyclo[10.2.2]hexadeca-1(15),12(16),13-triene-3-carboxamide
(3S,6R,7S)-N'-hydroxy-N-(2-methylamino-2-oxo-ethyl)-6-(2-methylpropyl)-5-oxo-11-oxa-4-azabicyclo[10.2.2]hexadeca-1(15),12(16),13-triene-3,7-dicarboxamide