Patent ID: 7034039

Claim:
A compound of the formula wherein ring A is a 5 to 10-membered aromatic ring having 1 to 3 substituent(s) selected from 1) a nitro group; 2) a cyano group; 3) a C 1-3 alkylenedioxy group; 4) a C 1-10 alkyl group or a C 2-10 alkenyl group, each having 1 to 3 substituent(s) selected from hydroxy group, carboxyl group, alkoxycarbonyl group having 2 to 8 carbon atoms, carbamoyl group, cyano group, amino group, alkanoylamino group having 2 to 8 carbon atoms, alkoxycarbonylamino group having 2 to 8 carbon atoms and alkylsulfonylamino group having 1 to 8 carbon atom(s); 5) an alkoxy group having 1 to 10 carbon atom(s), a cycloalkyloxy group having 3 to 10 carbon atoms or an aralkyloxy group having 7 to 13 carbon atoms, each having 1 to 3 substituent(s) selected from alkoxy group having 1 to 3 carbon atom(s), alkoxycarbonyl group having 2 to 5 carbon atoms, alkanoyl group having 2 to 5 carbon atoms, cyano group, carbamoyl group, hydroxy group, carboxyl group, amino group, alkanoylamino group having 2 to 5 carbon atoms and cycloalkyl group having 3 to 10 carbon atoms; 6) an acyl group; 7) an optionally substituted amino group; 8) an aryl group having 6 to 14 carbon atoms; 9) an optionally substituted thiol group; 10) an optionally substituted heterocyclic group; and 11) an amidino group; R 1 and R 2 are the same or different and each is an optionally substituted hydrocarbon group or an optionally substituted heterocyclic group; X is a bond, —O—, —S—, —SO—, —SO 2 — or —NR 3 — (R 3 is a hydrogen atom or an optionally substituted hydrocarbon group); and L is a divalent hydrocarbon group or a salt thereof.