| http://www.w3.org/ns/prov#value | - Other important compounds are those where R5 and R6 are as stated above and R7 has the formula ##STR8## where p is an integer from 0 to 5, especially from 1 to 4, q is an integer from 1 to 24, especially from 1 to 18, and the groups --Cp H2p -- and --Cq H2q+1 -- are preferably straight chains.
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