Z1 and Z2 are the same or different, being hydrogen, halogen, acyloxy of {HEAD ~ from 1 to 3 carbon atoms}; {TAIL ~ 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 
Z1 and Z2 are the same or different , being hydrogen , halogen , acyloxy of { HEAD ~ from 1 to 3 carbon atoms } ; { TAIL ~ 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 OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH 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