[CH2:1]([O:3][C:4]([C:6]1[O:14]C2N=NC=CC=2C=1O)=[O:5])[CH3:2].C(O[C:19](=[O:31])[C:20]1[C:25]([O:26][CH2:27][CH3:28])=[CH:24][C:23]([CH3:29])=[N:22][C:21]=1Cl)C>>[CH2:1]([O:3][C:4]([C:6]1[O:14][C:21]2=[N:22][C:23]([CH3:29])=[CH:24][C:25]([O:26][CH2:27][CH3:28])=[C:20]2[C:19]=1[OH:31])=[O:5])[CH3:2]This compound was prepared using a method analogous to that of 5-hydroxyfuro[2,3-c]pyridazine-6-carboxylic acid ethyl ester (A.2.3.1), 2-chloro-4-ethoxy-6-methylnicotinic acid ethyl ester replacing 3-chloropyridazine-4-carboxylic acid ethyl ester;
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