In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Potent and Selective Nonpeptidic Inhibitors of Procollagen C-Proteinase, published in 2007-07-26, which mentions a compound: 438630-64-9, Name is 1H-Pyrazole-4-sulfonyl chloride, Molecular C3H3ClN2O2S, Computed Properties of C3H3ClN2O2S.
6-Cyclohexyl-N-hydroxy-3-(1,2,4-oxadiazol-5-yl)hexanamides were previously disclosed as inhibitors of procollagen C-proteinase (PCP) culminating in the identification of amide 1. The objective was to discover a second inhibitor that would have improved affinity for PCP and to optimize properties for transepidermal delivery (TED) to intact skin. Further investigation of this template identified a number of potent PCP inhibitors (IC50 values of 2-6 nM) with improved TED flux. Sulfonamide (I) had excellent PCP enzyme activity when measured with a peptide substrate (Ki 8.7 nM) or with the endogenous substrate procollagen (IC50 3.4 nM) and demonstrates excellent selectivity over MMPs involved in wound healing (>10 000-fold). In the fibroplasia model, I inhibited deposition of insoluble collagen by 76±2% at 10 μM and was very effective at penetrating human skin in vitro with a TED flux of 1.5 μg/cm2/h, which compares favorably with values for agents that are known to penetrate skin well in vivo. Based on this profile, I (UK-421,045) was selected as a candidate for further preclin. evaluation as a topically applied, dermal antiscarring agent.
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