The CAS Registry Mumber 1357397-21-7 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,3,5,7,3,9 and 7 respectively; the second part has 2 digits, 2 and 1 respectively. Calculate Digit Verification of CAS Registry Number 1357397-21: (9*1)+(8*3)+(7*5)+(6*7)+(5*3)+(4*9)+(3*7)+(2*2)+(1*1)=187 187 % 10 = 7 So 1357397-21-7 is a valid CAS Registry Number.
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