prov:value
| - any two of R1 to R6 groups together may form an alkylene chain completing a 3, 4, 5, 6, 7, 8 or 9 membered alicyclic, fused, spiro, bicyclic and/or tricyclic ring system, which system may optionally include one or more non-adjacent carbonyl, oxa, alkylaza, or arylaza groups; with the proviso that at least one of R1 to R6 is other than hydrogen.
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