The CAS Registry Mumber 145306-59-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,5,3,0 and 6 respectively; the second part has 2 digits, 5 and 9 respectively. Calculate Digit Verification of CAS Registry Number 145306-59: (8*1)+(7*4)+(6*5)+(5*3)+(4*0)+(3*6)+(2*5)+(1*9)=118 118 % 10 = 8 So 145306-59-8 is a valid CAS Registry Number.