The CAS Registry Mumber 134619-52-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,4,6,1 and 9 respectively; the second part has 2 digits, 5 and 2 respectively. Calculate Digit Verification of CAS Registry Number 134619-52: (8*1)+(7*3)+(6*4)+(5*6)+(4*1)+(3*9)+(2*5)+(1*2)=126 126 % 10 = 6 So 134619-52-6 is a valid CAS Registry Number.