321 Amino Acids and Related Compounds 



670 d-Diaminosuccinic Acid, C4HSO4N0, colorless crystals, m.p. 



(dec), 240-290°, [aW +28° (c 2.0 in 5% sodium hy- 

 droxide solution). 



HOOC— CH— CH— COOH 



I I 

 NH2 NH2 



Streptomyces rimosus 



This amino acid sometimes crystallizes from oxytetra- 

 cycline broth concentrates. The yield is about 250-500 

 mg. per liter. 



F. A. Hochstein, /. Org. Chem. 24 679 (1959). 



671 O-Carbamyl-D-serine, C4H8O4N2, colorless needles, m.p. 226- 



234° (dec), [ah -19.6° (c 2 in N hydrochloric acid). 



O 



il 

 H2N— C— O— CHo— CH— COOH 



I 

 NH2 



Streptomyces polychromogenes 



D-Serine or derivatives is also present in polymyxin, 

 echinomycin, cycloserine and amicetin. 



G. Hagemann, L. Penasse and J. Teillon, Biochim. et Bio- 

 phys. Acta 17 240 (1955). 



672 Allantoic Acid, C4HSO4N4, colorless needles, m.p. 165° (dec). 



H2NCONH 



\ 



CH— COOH 



/ 

 H2NCONH 



Coprinus miraceus, Collybia dryophila 



R. Fosse and A. Brunei, Compt. rend. 197 288 (1933). 



673 y-Aminobutyric Acid, C4H9O2N, colorless crystals, m.p. 202° 



(dec) rapid heating. 



H2N— CH2— CH2— CH2— COOH 

 Widely distributed. 



