| prov:value
| - A compound having the structure wherein m is 0, 1 or 2; n=0, 1 or 2; A is (CH2), where x is 1 to 5; or A is (CH2)x 1, where x1 is 2 to 5, with an alkenyl bond or an alkynyl bond embedded in the chain; or A is ???(CH2)x 2???O???(CH2)x 3???where x2 is 0 to 5 and x3 is 0 to 5, provided that at least one of x2 and x3 is other than 0, R1 is H or alkyl; R2 is H, alkyl, alkoxy, halogen, amino or substitu
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