The CAS Registry Mumber 58508-46-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,8,5,0 and 8 respectively; the second part has 2 digits, 4 and 6 respectively. Calculate Digit Verification of CAS Registry Number 58508-46: (7*5)+(6*8)+(5*5)+(4*0)+(3*8)+(2*4)+(1*6)=146 146 % 10 = 6 So 58508-46-6 is a valid CAS Registry Number.