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2 Muhammad Nadeem Arshad, Muhammad Zia-ur-Rehman, Naveed Ahmed and Islam Ullah Khan .
Piperidinium 4-hydroxy-3-methoxycarbonyl-1,2-benzothiazin-2-ide 1,1-dioxide , Acta Cryst (2009). E65, o2451Â Â Waseeq Ahmad Siddiqui, Saeed Ahmad, Hamid Latif Siddiqui, Mujahid Hussain Bukhari and Masood Parvez .
Methyl 4-hydroxy-2H-1,2-benzothiazine-3-carboxylate 1,1-dioxide , Acta Cryst (2008). E64, o1922Â Â