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https://theses.gla.ac.uk/79929/ Polysulphonyl Methanes: A Contribution to the Organic Chemistry of Sulphur - Enlighten Theses to the https://pubchem.ncbi.nlm.nih.gov/patent/EP-0290906-A3 Azolyl-tetrahydrofuran-2-ylidene-methanes - Patent EP-0290906-A3 - PubChem EP-0290906-A3 chemical patent summary. tetrahydrofuran patent ep pubchem