The CAS Registry Mumber 1214328-36-5 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,2,1,4,3,2 and 8 respectively; the second part has 2 digits, 3 and 6 respectively. Calculate Digit Verification of CAS Registry Number 1214328-36: (9*1)+(8*2)+(7*1)+(6*4)+(5*3)+(4*2)+(3*8)+(2*3)+(1*6)=115 115 % 10 = 5 So 1214328-36-5 is a valid CAS Registry Number.