(6R,7R)-7-[[(2Z)-2-ethoxyimino-2-[5-(phosphonoamino)-1,2,4-thiadiazol-3-yl]acetyl]amino]-3-[[4-(1-methylpyridin-1-ium-4-yl)-1,3-thiazol-2-yl]sulfanyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate
(6R,7R)-7-[[(2Z)-2-ethoxyimino-2-[5-(phosphonoamino)-1,2,4-thiadiazol-3-yl]acetyl]amino]-3-[4-(1-methylpyridin-1-ium-4-yl)thiazol-2-yl]sulfanyl-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate
(6R,7R)-7-[[(2Z)-2-ethoxyimino-1-oxo-2-[5-(phosphonoamino)-1,2,4-thiadiazol-3-yl]ethyl]amino]-3-[[4-(1-methyl-4-pyridin-1-iumyl)-2-thiazolyl]thio]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate
(6R,7R)-7-[[(2Z)-2-ethoxyimino-2-[5-(phosphonoamino)-1,2,4-thiadiazol-3-yl]acetyl]amino]-8-keto-3-[[4-(1-methylpyridin-1-ium-4-yl)thiazol-2-yl]thio]-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate
(6R,7R)-7-[[(2Z)-2-ethoxyimino-2-[5-(phosphonoamino)-1,2,4-thiadiazol-3-yl]ethanoyl]amino]-3-[[4-(1-methylpyridin-1-ium-4-yl)-1,3-thiazol-2-yl]sulfanyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate