(10) an intermediate represented by the following formula IX for synthesizing the amide derivative of formula I: ##STR9## where in the formula IX, when R9 is a hydrogen atom, R10 represents an alkanoyl group having 1 to 8 carbon atoms of a carbon chain that may have a branched chain, a haloalkanoyl group having 1 to 8 carbon atoms of a carbon chain that may have a branched chain, a phenylalkanoyl