The CAS Registry Mumber 1624261-89-7 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,6,2,4,2,6 and 1 respectively; the second part has 2 digits, 8 and 9 respectively. Calculate Digit Verification of CAS Registry Number 1624261-89: (9*1)+(8*6)+(7*2)+(6*4)+(5*2)+(4*6)+(3*1)+(2*8)+(1*9)=157 157 % 10 = 7 So 1624261-89-7 is a valid CAS Registry Number.
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