A base associated with the pyridine group, present in coal tar.
the a number of isometric substances which parvoline may be the kind.
A liquid base, C9H13N, for the pyridine team, present in coal tar; in addition, anybody for the group of isomeric substances of which this is the kind.
Tetramethylpyri-dine, C5HN(CH3)4. Of the a number of isomeric types, the principal one is 2,3,4,5-tetra-methylpyridine, an oil which does occur in coal-tar. Other types are produced by distilling bituminous shales, warming cinchonine with potash, or by the decay of horse-fiesh or mackerel. They are standard essential oils which form salts with acids.