1 64F 1-butylisochromeno[3,4-C]pyrazol-5(3h)-one 1.000 2 64E 1-propylisochromeno[3,4-C]pyrazol-5(3h)-one 0.944 3 64C 1-ethylisochromeno[3,4-C]pyrazol-5(3h)-one 0.889 4 6BL 1-methyl[2]benzopyrano[3,4-C]pyrazol-5(3h)-one 0.833