Guanine

**Semantic type:** Nucleic Acid, Nucleoside, or Nucleotide

**Definition:** A purine base that is a constituent of nucleotides occurring in nucleic acids.

**Synonyms:** - 2-Amino-1,7-dihydro-6H-purin-6-one - 2-Amino-1,7-dihydro-6H-purin-6-one - 2-Amino-6-Hydroxypurine - GUANINE - guanine