... Research on Chemical Intermediates. ... 1), with the chemical name: (6R, 7R)-7-{(2Z)-2-(ethoxyimino)- 2-[5-(phosphonoamino)-1,2,4-thiadiazol-3-yl]acetamido}-3 ... preparing 2-substituted hydroxyimino-2-(5-amino-1,2,4-thiadiazol-3yl)acetic acid or its salt, and intermediates thereof. ...