Ill Polyenes and Polyynes, Excluding Polyene Macrolides 



196 Biformin, highly unstable crystals. 



Probably a straight-chain, nine carbon atom glycol, con- 

 taining two acetylenic and two ethylenic bonds in con- 

 jugation. 



Polyporus bifonnis 



A similar substance, biforminic acid, occurred in the 

 same culture. 



William J. Robblns, Frederick Kavanagh and Annette 

 Hervey, Proc. Nat. Acad. Sci. 33 176 (1947). 



Marjorie Anchel and Marvin P. Cohen, /. Biol. Chem. 208 

 319 (1954). 



197 tra?2S-Dec-2-ene-4,6,8-triyn-l-al, CjoHuO, pale yellow needles, m.p. 



108°, U.V. (225) (234.5), 245.5, 258 (272), 288, 306, 

 326, 350, m^ in hexane. 



CH3— C^C— C=C— C=C— CH=CH— CHO 



Pleurotus ulmarius 



J. N. Gardner, E. R. H. Jones, P. R. Leeming and J. S. 

 Stephenson, J. Chem. Soc, 691 (1960). 



198 Diatretyne-3 (traris-10-Hydroxydec-2-ene-4,6,8-triynoic Acid), 



Ci„H«;03^ nearly colorless rods from ethyl acetate, rapidly 

 becoming coated with blue-green polymer, U.V. 253, 280, 

 297, 316, 339 m^. 



HOCH2— C=C— C^C— C^C— CH=CH— COOH 



Clitocybe diatreta 



The author noted the similarity to the antibiotic prin- 

 ciple of the royal jelly of bees: 



trans 

 HOCH,CH2CH2CH,CHoCHoCH2— CH=CH— COOH 



Helen Flon and Marjorie Anchel, Arch. Biochem. and 

 Biophys. 78 111 (1958). 



Marjorie Anchel, Arch. Biochem. and Biophys. 85 569 

 (1959). 



199 Deca-trarzs-2,tra?is-8-diene-4,6-diyne-l,10-dioic Acid, Ci„Hg04, 



amorphous powder, m.p. (dec.) ^200°, U.V. 216 (258), 

 267, 296, 315, 338 m^^ in ethanol. 



HOOC— CH=CH— C^C— C=C— CH=CH— COOH 



Polyporus anthracophilus 



