The CAS Registry Mumber 35959-73-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,5,9,5 and 9 respectively; the second part has 2 digits, 7 and 3 respectively. Calculate Digit Verification of CAS Registry Number 35959-73: (7*3)+(6*5)+(5*9)+(4*5)+(3*9)+(2*7)+(1*3)=160 160 % 10 = 0 So 35959-73-0 is a valid CAS Registry Number.