172 THE ANTIBIOTICS 



b 2 . C4M7H8O-MO1S 



X-206 



C*. C86H40O7 



X-464 



d 2 . ChH,|0, 



X-537A 



b 1 . Also active against fungi and viruses. 



Cardicin 

 b. Stable basic compounds, containing nitrogen. 

 a 1 . C 2 oH !6 Nj0 6 



Nitrosporin 

 b 1 . dH^NOs, 



C28H 4 9N0 8 , 

 C^NOe, 



Proactinomycins A, B, C 

 c l . C 86 H4 3 N0 7 



Picromycin 

 d x . Other compounds. 



Camphomycin 

 e 1 . Containing chlorine (?) 



Exfoliatin 



Sarcidin 

 II. Soluble in water and in organic solvents other than ether. 



1. Pigmented substances. 



a. Yellowish orange crystals, acid-stable. 



Luteomycin 



b. Yellowish green at neutral reaction. 



Actinomycelin 



c. Red prisms; unstable; high molecular weight. 



Nocardianin 



2. Nonpigmented substances. 



a. Monobasic acid containing nitrogen and sulfur; primarily- 

 active against mycobacteria. 



Actiihiazic acid 



b. Highly unstable unsaturated acid. 



Mycomycin 



c. Basic compounds. 



a 1 . Tetra acidic base containing a substituted guanidino 

 group, active against certain bacteria and insects. 

 Netropsin 

 b 1 . Active against gram-positive bacteria, especially myco- 

 bacteria. .A micetin 



