{HEAD ~ Methylation} of compound 3 with {TAIL ~ iodomethane} in the presence of a base, such as sodium hydride, provides N methylated product of structure 5 
{ HEAD ~ Methylation } of compound 3 with { TAIL ~ iodomethane } in the presence of a base , such as sodium hydride , provides N methylated product of structure 5
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH 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