preparation methods of nicotinoyl glycine
As a microscale laboratory method, it should be possible to react nicotinic acid with, e.g., thionyl chloride, yielding nicotinoyl chloride (the acid chloride of nicotinic acid). This can be reacted with glycine to yield the desired product. Unfortunately, glycine would exist predominantly in zwitterionic form at neutral pH, so I would guess that pre-treatment of the glycine with base would probably be required prior to the reaction with nicotinoyl chloride.