The CAS Registry Mumber 27910-38-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,7,9,1 and 0 respectively; the second part has 2 digits, 3 and 8 respectively. Calculate Digit Verification of CAS Registry Number 27910-38: (7*2)+(6*7)+(5*9)+(4*1)+(3*0)+(2*3)+(1*8)=119 119 % 10 = 9 So 27910-38-9 is a valid CAS Registry Number.
Semisynthetic β-lactam antibiotics, II. Cephalosporin derivatives in the naphthalene series. Chemical and microbiological properties
Quaresima,Tinti,Foresta,De Witt,Ramacci
, p. 1311 - 1318 (1979)
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