The CAS Registry Mumber 148607-23-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,8,6,0 and 7 respectively; the second part has 2 digits, 2 and 3 respectively. Calculate Digit Verification of CAS Registry Number 148607-23: (8*1)+(7*4)+(6*8)+(5*6)+(4*0)+(3*7)+(2*2)+(1*3)=142 142 % 10 = 2 So 148607-23-2 is a valid CAS Registry Number.