The CAS Registry Mumber 59346-18-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,9,3,4 and 6 respectively; the second part has 2 digits, 1 and 8 respectively. Calculate Digit Verification of CAS Registry Number 59346-18: (7*5)+(6*9)+(5*3)+(4*4)+(3*6)+(2*1)+(1*8)=148 148 % 10 = 8 So 59346-18-8 is a valid CAS Registry Number.