1(6H)-Pyridazinebutanoic acid, 6-oxo-3-(2-phenylpyrazolo(1,5-a)pyridin-3-yl)- 131185-37-0 6-Oxo-3-(2-phenylpyrazolo(1,5-a)pyridin-3-yl)-1(6H)-pyridazineboutanoic acid 6-Oxo-3-(2-phenylpyrazolo(1,5-a)pyridin-3-yl)-1(6H)-pyridazinebutyric acid FK 838 FK-838