The CAS Registry Mumber 103909-77-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,3,9,0 and 9 respectively; the second part has 2 digits, 7 and 7 respectively. Calculate Digit Verification of CAS Registry Number 103909-77: (8*1)+(7*0)+(6*3)+(5*9)+(4*0)+(3*9)+(2*7)+(1*7)=119 119 % 10 = 9 So 103909-77-9 is a valid CAS Registry Number.
Synthetic studies of vitamin D3 analogues. VIII. Synthesis of 22-oxavitamin D3 analogues
Murayama,Miyamoto,Kubodera,Mori,Matsunaga
, p. 4410 - 4413 (2007/10/02)
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