The CAS Registry Mumber 56388-44-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,6,3,8 and 8 respectively; the second part has 2 digits, 4 and 4 respectively. Calculate Digit Verification of CAS Registry Number 56388-44: (7*5)+(6*6)+(5*3)+(4*8)+(3*8)+(2*4)+(1*4)=154 154 % 10 = 4 So 56388-44-4 is a valid CAS Registry Number.
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