An ortho-rhom-bic polymorph of 2-(1,3,5-di-thia-zinan-5-yl)ethanol or MEA-di-thia-zine.

Substituted triazines are a class of compounds utilized for scavenging and sequestering hydrogen sulfide in oil and gas production operations. The reaction of one of these triazines under field conditions resulted in the formation of the title compound, 2-(1,3,5-di-thia-zinan-5-yl)ethanol, C 5 H 11 NOS 2 , or MEA-di-thia-zine. Polymorphic form I, in space group I 4 1 / a , was first reported in 2004 and its extended structure displays one-dimensional, helical strands connected through O-H⋯O hydrogen bonds. We describe here the form II polymorph of the title compound, which crystallizes in the ortho-rhom-bic space group Pbca as centrosymmetric dimers through pairwise O-H⋯N hydrogen bonds from the hydroxyl moiety to the nitro-gen atom of an adjacent mol-ecule.