10-Ethynyl-2,3,6,6a,9,10-hexahydro-1H-6,9-methanopyrrolo[2,1-i][2,1]benz othiazol-10-ol 5,5-dioxide

In the title compound, C13H15NO3S, the sole classical hydrogen-bond donor is involved in an intramolecular O-H center dot center dot center dot N hydrogen bond. In the crystal structure, pairs of molecules related by inversion centres are linked by pairs of weak intermolecular C-H center dot center dot center dot O interactions; these centrosymmetric pairs are, in turn, linked further by weak intermolecular C-H center dot center dot center dot O interactions, forming two-dimensional sheets oriented parallel to (101).