Abstract: This invention relates to 8-chlorodibenz[b,f][1,4]oxazepine-10(11H)-carboxylic acid, 2-[(substituted phenylsulfinyl)alkanoyl]hydrazides and 8-chlorodibenz[b,f][1,4]oxazepine-10(11H)-carboxylic acid, 2-[(substituted phenylsulfonyl)alkanoyl]hydrazides that are useful as prostaglandin antagonists and analgesic agents. This invention also relates to 8-chlorodibenz[b,f][1,4]oxazepine-10(11H)-carboxylic acid, 2-[(substituted phenylthio)alkanoyl]hydrazides that are useful as intermediates in the preparation of the corresponding sulfinyl and sulfonyl compounds.