Patent ID: 7176240

Claim:
A compound of the formula (I): wherein R 1 is C1–10 alkyl having one carbon substituted by 1–3 fluorines; R 2 is hydroxy, C1–4 alkoxy, C1–4 alkoxy substituted by 1 of phenyl, or NR 3 R 4 , in which R 3 and R 4 each, independently, is (i) hydrogen, (ii) C1–4 alkyl, (iii) phenyl, (iv) phenyl substituted by C1–4 alkoxy or carboxyl, (v) 4–7 membered heterocyclic ring containing one nitrogen or (vi) C1–4 alkyl substituted by phenyl, phenyl substituted by C1–4 alkoxy or carboxyl, or 4–7 membered heterocyclic ring containing one nitrogen, or the nitrogen atom bonded to them, taken together is 4–7 membered saturated heterocyclic ring containing one or two nitrogen(s) or one nitrogen and one oxygen, or amino acid residue; with the proviso that, R 1 is not F—(CH 2 ) 4 —, F—(CH 2 ) 5 —, F—(CH 2 ) 6 —, F 3 C—CH 2 —, or non-toxic salts thereof or acid addition salts thereof.