The CAS Registry Mumber 101857-91-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,1,8,5 and 7 respectively; the second part has 2 digits, 9 and 1 respectively. Calculate Digit Verification of CAS Registry Number 101857-91: (8*1)+(7*0)+(6*1)+(5*8)+(4*5)+(3*7)+(2*9)+(1*1)=114 114 % 10 = 4 So 101857-91-4 is a valid CAS Registry Number.
Studies on orally active cephalosporin esters. II. Chemical stability of pivaloyloxymethyl esters in phosphate buffer solution
Miyauchi,Sasahara,Fujimoto,Kawamoto,Ide,Nakao
, p. 2369 - 2374 (1989)
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