prov:value
| - (i) lower alkyl (for example, C1-6 alkyl such as methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, tert-butyl, pentyl, hexyl etc.), (ii) lower alkenyl (for example, C2-6 alkenyl such as vinyl, allyl, isopropenyl, butenyl, isobutenyl, sec-butenyl etc.), (iii) lower alkynyl (for example, C2-6 alkynyl such as ethynyl, 1-propynyl, propargyl, butynyl, 1-hexynyl etc.) (iv) C3-6 cycloalkyl (f
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