The CAS Registry Mumber 77405-60-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,7,4,0 and 5 respectively; the second part has 2 digits, 6 and 0 respectively. Calculate Digit Verification of CAS Registry Number 77405-60: (7*7)+(6*7)+(5*4)+(4*0)+(3*5)+(2*6)+(1*0)=138 138 % 10 = 8 So 77405-60-8 is a valid CAS Registry Number.
Synthesis of 16-Membered-Ring Macrolide Antibiotics. 3. Carbomycin B and Leucomycin A3: Retrosynthetic Studies
Nicolaou, K. C.,Seitz, S. P.,Pavia, M. R.
, p. 1222 - 1224 (1981)
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