Biosynthesis of the pyridine ring of ricinine.
D000470:Alkaloids / Q000378:metabolism*; D011725:Pyridines / Q000378:metabolism*; D011728:Pyridones; D012278:Ricinus / Q000378:metabolism*
D000470:Alkaloids; D011725:Pyridines; D011728:Pyridones; C019550:ricinine; C023666:pyridine
ALKALOIDS/metabolism; PYRIDINES/metabolism; RICINUS/metabolism