The CAS Registry Mumber 187592-21-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,7,5,9 and 2 respectively; the second part has 2 digits, 2 and 1 respectively. Calculate Digit Verification of CAS Registry Number 187592-21: (8*1)+(7*8)+(6*7)+(5*5)+(4*9)+(3*2)+(2*2)+(1*1)=178 178 % 10 = 8 So 187592-21-8 is a valid CAS Registry Number.
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