prov:value
| - ituted in available positions by N, O, or S atoms, or R2 is an aralkyl or aralkenyl group of at least 14 carbon atoms, preferably at least 18 carbon atoms, and more preferably at least 22 carbon atoms; R4 is equivalent to either R2 or R3 and is preferably equivalent to R3 ; and X is a halogen, R5 SO3 -, R5 SO4 -, R5 CO2 -, (R5)2 PO4 -, or (R5)PO4 =(wherein R5 is defined below in class 6).
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