The aglycone component of the streptomycin molecule joined with streptobiosamine through a glycosidic linkage. Obtained from streptomycin by acid hydrolysis: Peck et al., J. Am. Chem. Soc. 68, 29 (1946); Fried et al., J. Biol. Chem. 162, 391 (1946). Structure: Carter et al., Science 103, 53, 540 (1946). Synthesis: Wolfrom et al., J. Am. Chem. Soc. 72, 1724 (1950). Absolute configuration: Dyer, Todd, ibid. 85, 3896 (1963); Tatsuoka, Horii, J. Antibiot. 17A, 88 (1964). Biosynthesis studies: Bruton et al., J. Biol. Chem. 242, 813 (1967).