Z1 and Z2 are the same or different, being hydrogen, halogen, {HEAD ~ acyloxy} of {TAIL ~ from 1 to 3 carbon atoms}; alkoxy of from 1 to 3 carbon atoms, hydrocarbyl, carboxy, cyano, or carboalkoxy wherein the alkoxy group is from 1 to 3 carbon atoms; and 
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Z1 and Z2 are the same or different , being hydrogen , halogen , { HEAD ~ acyloxy } of { TAIL ~ from 1 to 3 carbon atoms } ; alkoxy of from 1 to 3 carbon atoms , hydrocarbyl , carboxy , cyano , or carboalkoxy wherein the alkoxy group is from 1 to 3 carbon atoms ; and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH