http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
chemistry of open-chain organic nitrogen compounds
v. 1. Functions derived from ammonia: amines, amides, imines, nitriles, isocyanates, etc.--v. 2. Derivatives of oxidized nitrogen: hydrazines to nitrates.