Proper noun
IUPAC
(chemistry) Acronym of International Union of Pure and Applied Chemistry: an organization that establishes official names of chemical elements and compounds.
According to the IUPAC definition, a metallocene contains a transition metal and two cyclopentadienyl ligands coordinated in a sandwich structure, i.e., the two cyclopentadienyl anions are on parallel planes with equal bond lengths and strengths. Source: Internet
Amino acid and nucleotide base codes IUPAC also has a system for giving codes to identify amino acids and nucleotide bases. Source: Internet
After the war, East and West Germany were eventually readmitted to IUPAC. Source: Internet
An IUPAC project, "Towards a comprehensive definition of oxidation state", (project 2008-040-1-200) started in 2009. Source: Internet
Although many other chemists have repeated this advice, IUPAC and most chemistry texts still favour the usage of allotrope and allotropy for elements only. Source: Internet
Although rarely used, IUPAC -recommended names also exist. Source: Internet