Crystal structure of 2-{[5-amino-1-(phenyl-sulfon-yl)-1H-pyrazol-3-yl]-oxy}-1-(4-methyl-phen-yl)ethan-1-one.

In the title compound, C(18)H(17)N(3)O(4)S, the pyrazole ring is planar, with the sulfur atom lying 0.558†(1)†à out of the ring plane. The NH(2) group is involved in an intra-molecular hydrogen bond to a sulfonyl oxygen atom; its other hydrogen atom forms an asymmetric three-centre hydrogen bond to the two oxygen atoms of the -O-CH(2)-C=O- grouping, via the 2(1) screw axis, forming a ribbon structure parallel to the b axis. Translationally adjacent, coplanar ribbons form a layer parallel to (10).