2-Methyl-3-((2-pyridinylamino)carbonyl)-2H-1,2-benzothiazin-4-yl 2,2-dimethylpropanoate S,S-dioxide 87027-09-6 Chf 10-21 Piroxicam pivalic ester Propanoic acid, 2,2-dimethyl-, 2-methyl-3-((2-pyridinylamino)carbonyl)-2H-1,2-benzothiazin-4-yl ester, S,S-dioxide