The CAS Registry Mumber 664358-44-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,6,4,3,5 and 8 respectively; the second part has 2 digits, 4 and 4 respectively. Calculate Digit Verification of CAS Registry Number 664358-44: (8*6)+(7*6)+(6*4)+(5*3)+(4*5)+(3*8)+(2*4)+(1*4)=185 185 % 10 = 5 So 664358-44-5 is a valid CAS Registry Number.
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