Cyclopropachromencarboxylic acid derivatives

A cyclopropachromencarboxylic acid derivative and its pharmaceutically acceptable salts represented by the following formula (I):

• ##STR77## wherein A denotes a hydroxyimino group, an alkyloxyimino group having 1 to 5 carbon atoms, or the group .dbd.N--O--(CH.sub.2).sub.n --NR.sup.1 R.sup.2 where n represents an integer of 2 to 8, and each of R.sup.1 and R.sup.2 independently represents a hydrogen atom or alkyl group having 1 to 5 carbon atoms, respectively;
• B denotes the group --COOR.sup.3 where R.sup.3 represents a hydrogen atom or alkyl group having 1 to 5 carbon atoms, or the group --CONR.sup.4 R.sup.5 where R.sup.4 and R.sup.5 independently represent a hydrogen atom, alkyl group having 1 to 5 carbon atoms, alkenyl group having 2 to 5 carbon atoms, aminoalkyl group wherein N is optionally substituted, a phenyl group optionally substituted with a halogen atom or hydroxyl group in turn optionally substituted, a 2-pyridyl group, or aralkyl group having 7 to 10 carbon atoms;
• and
• X is a halogen atom or the group --OR.sup.6 where R.sup.6 represents a hydrogen atom an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 3 to 6 carbon atoms, or an aralkyl group having 7 to 10 carbon atoms.