This class also includes two additional products, MS 457.947 and MS 474.12, which result from the coupling of related C 9 radicals with 5-position chlorinated PI radicals (Figure ). Notably, the coupling process appears to favor C 9 acid/alcohol unsaturated chain keto radicals over shorter counterparts (C 6 -C 8 ). This preference may be attributed to the longer half-life of C 9 radicals within the system.