The CAS Registry Mumber 74595-22-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,4,5,9 and 5 respectively; the second part has 2 digits, 2 and 2 respectively. Calculate Digit Verification of CAS Registry Number 74595-22: (7*7)+(6*4)+(5*5)+(4*9)+(3*5)+(2*2)+(1*2)=155 155 % 10 = 5 So 74595-22-5 is a valid CAS Registry Number.