The CAS Registry Mumber 82257-54-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,2,2,5 and 7 respectively; the second part has 2 digits, 5 and 4 respectively. Calculate Digit Verification of CAS Registry Number 82257-54: (7*8)+(6*2)+(5*2)+(4*5)+(3*7)+(2*5)+(1*4)=133 133 % 10 = 3 So 82257-54-3 is a valid CAS Registry Number.
An stereocontrolled partial synthesis of 1α-hydroxy vitamin D3
Vanmaele,De Clercq,Vandewalle
, p. 995 - 998 (1982)
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