Patent ID: 6989401

Claim:
A sulfonic acid compound of hydroxamic acid of the formula (I): wherein X is hydrogen or a hydroxyl group-protecting group; R 1 is phthalimidomethyl; R 2 is hydrogen, alkyl, arylalkyl, heteroarylalkyl, cycloalkyl, cycloalkylalkyl or aryl; Y is O, NR 7 wherein R 7 is as defined for R 2 or S; n is an integer of any of 1 to 6; R 3 is hydrogen, halogen, hydroxyl group, trifluoromethyl, cyano, nitro, amino, alkyl, alkoxy, acyloxy, carbamoyl, lower alkylamino or dilower alkylamino group; R 4 is OR 8 wherein R 8 is hydrogen, lower alkyl, aryl, heteroaryl, arylalkyl or heteroarylalkyl or NR 10 R 11 wherein R 10 and R 11 are the same or different and each is hydrogen, lower alkyl, arylalkyl, heteroaryl, heteroarylalkyl or aryl, or R 10 and R 11 optionally form an optionally substituted hetero ring together with the adjacent nitrogen atom; and said arylalkyl, heteroarylalkyl, heteroarylalkylthioalkyl, heteroarylthioalkyl, arylthioalkyl, arylalkylthioalkyl, phthalimidomethyl, aryl and heteroaryl optionally have substituents, or a pharmacologically acceptable salt thereof.