6H6S:
reference: Non-crystallographic symmetry in proteins: Jahn-Teller-like and Butterfly-like effects?, Silva JM, Giuntini S, Cerofolini L, Geraldes CFGC, Macedo AL, Ravera E, Fragai M, Luchinat C, Calderone V, J Biol Inorg Chem. 2018 Nov 23. pii: 10.1007/s00775-018-1630-0. doi:, 10.1007/s00775-018-1630-0. PMID: 30470900

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