preferred_name: pyridine + S-adenosyl-L-methionine <=> N-methylpyridinium + S-adenosyl-L-homocysteine
preferred_name_lc: pyridine + s-adenosyl-l-methionine <=> n-methylpyridinium + s-adenosyl-l-homocysteine
label: pyridine + S-adenosyl-L-methionine <=> N-methylpyridinium + S-adenosyl-L-homocysteine
label_lc: pyridine + s-adenosyl-l-methionine <=> n-methylpyridinium + s-adenosyl-l-homocysteine