The CAS Registry Mumber 390356-81-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 3,9,0,3,5 and 6 respectively; the second part has 2 digits, 8 and 1 respectively. Calculate Digit Verification of CAS Registry Number 390356-81: (8*3)+(7*9)+(6*0)+(5*3)+(4*5)+(3*6)+(2*8)+(1*1)=157 157 % 10 = 7 So 390356-81-7 is a valid CAS Registry Number.
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