The CAS Registry Mumber 21973-60-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,9,7 and 3 respectively; the second part has 2 digits, 6 and 0 respectively. Calculate Digit Verification of CAS Registry Number 21973-60: (7*2)+(6*1)+(5*9)+(4*7)+(3*3)+(2*6)+(1*0)=114 114 % 10 = 4 So 21973-60-4 is a valid CAS Registry Number.
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