| http://www.w3.org/ns/prov#value | - R1, R12, R6 and R7 are as defined in claim 1 and; X is where Y is ???(CH2)m?????? where m??? is an integer of 0 to 3, or Y is ???(CH2)n???Z??????(CH2)p??? where n is an integer of 0 to 2, p is an integer of 0 to 2 and Z??? is a heteroatom or Z??? is a carbon atom substituted with one or two C1-6 alkyl groups.
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