Patent ID: 7087594

Claim:
An alkyl ether represented by the formula, or its salts: wherein each of R 1 and R 2 , which may be the same or different, represents one or more groups selected from the group consisting of a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl, aryl, aralkyl, alkoxy, aryloxy, alkylthio, arylthio, alkenyl, alkenyloxy, amino, alkylsulfonyl, arylsulfonyl, carbamoyl, a protected or unprotected amino, hydroxyl or carboxyl group, a nitro group, and an oxo group; R 3 is a substituted or unsubstituted alkylamino group, or a protected or unprotected amino or hydroxyl group; the ring A is thiophene; each of m and n is an integer of 1 to 6; and p is an integer of 1.