The CAS Registry Mumber 56336-21-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,6,3,3 and 6 respectively; the second part has 2 digits, 2 and 1 respectively. Calculate Digit Verification of CAS Registry Number 56336-21: (7*5)+(6*6)+(5*3)+(4*3)+(3*6)+(2*2)+(1*1)=121 121 % 10 = 1 So 56336-21-1 is a valid CAS Registry Number.
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