The CAS Registry Mumber 62326-48-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,2,3,2 and 6 respectively; the second part has 2 digits, 4 and 8 respectively. Calculate Digit Verification of CAS Registry Number 62326-48: (7*6)+(6*2)+(5*3)+(4*2)+(3*6)+(2*4)+(1*8)=111 111 % 10 = 1 So 62326-48-1 is a valid CAS Registry Number.