[Syntheses of nitrogen-containing triterpenes. I. Derivatives of ursolic acid and oleanolic acid].
1973
M Yasue, and
J Sakakibara, and
T Kaiya
UI
MeSH Term
Description
Entries
D009584
Nitrogen
An element with the atomic symbol N, atomic number 7, and atomic weight [14.00643; 14.00728]. Nitrogen exists as a diatomic gas and makes up about 78% of the earth's atmosphere by volume. It is a constituent of proteins and nucleic acids and found in all living cells.
D002264
Carboxylic Acids
Organic compounds containing the carboxy group (-COOH). This group of compounds includes amino acids and fatty acids. Carboxylic acids can be saturated, unsaturated, or aromatic.