The CAS Registry Mumber 53216-90-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,3,2,1 and 6 respectively; the second part has 2 digits, 9 and 0 respectively. Calculate Digit Verification of CAS Registry Number 53216-90: (7*5)+(6*3)+(5*2)+(4*1)+(3*6)+(2*9)+(1*0)=103 103 % 10 = 3 So 53216-90-3 is a valid CAS Registry Number.
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