{HEAD ~ R14} is hydrogen, nitro, cyano or {TAIL ~ C1 4 alkylcarbonyl}; and 
is
{ HEAD ~ R14 } is hydrogen , nitro , cyano or { TAIL ~ C1 4 alkylcarbonyl } ; and
HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH