Claims
- 1. A compound of the formula: wherein R11 represents C1-6 alkyl, R21 represents phenyl which may be substituted, or R11 and R21 form, taken together with adjacent two carbon atoms, a 5- to 7-membered ring which may be substituted, R3 represents a hydrocarbon group which may be substituted, and R5 represents hydrogen or a hydrocarbon group, or a salt thereof.
- 2. A compound of claim 1 or a salt thereof, wherein the substituent of the phenyl which may be substituted for R21 is isobutyrylamino or methoxy.
- 3. A compound of claim 1 or a salt thereof, which is 4-hydroxy-5-isobutyryl-3-methyl-2-phenylthieno[2,3-b]pyridine.
- 4. A compound of claim 1 or a salt thereof, which is 4-hydroxy-5-isobutyryl-2-(4-isobutyrylaminophenyl)-3-methylthieno[2,3-b]pyridine.
Priority Claims (2)
Number |
Date |
Country |
Kind |
9-218862 |
Aug 1997 |
JP |
|
9-218863 |
Aug 1997 |
JP |
|
Parent Case Info
This application is a division of U.S. patent application Ser. No. 09/446,542, now U.S. Pat. No. 6,313,301, issued Nov. 6, 2001, which was the Natigdal Phase filing of International Patent Application No. PCT/JP98/03575, filed Aug. 11, 1998.
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