The CAS Registry Mumber 1048-51-7 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,0,4 and 8 respectively; the second part has 2 digits, 5 and 1 respectively. Calculate Digit Verification of CAS Registry Number 1048-51: (6*1)+(5*0)+(4*4)+(3*8)+(2*5)+(1*1)=57 57 % 10 = 7 So 1048-51-7 is a valid CAS Registry Number.
Asymmetric reduction of steroidal 20-ketones: Chemical synthesis of corticosteroid derivatives containing the 20α, 21-diol and 17α, 20α, 21-triol side chains
Han,Monder
, p. 619 - 626 (1983)
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