O-benzhydryl (6R)-7-[[(2Z)-2-methoxyimino-2-[2-(tritylamino)-1,3-thiazol-4-yl]acetyl]amino]-8-oxo-3-(oxolan-3-yl)-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carbothioate