The CAS Registry Mumber 4992-59-0 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 4,9,9 and 2 respectively; the second part has 2 digits, 5 and 9 respectively. Calculate Digit Verification of CAS Registry Number 4992-59: (6*4)+(5*9)+(4*9)+(3*2)+(2*5)+(1*9)=130 130 % 10 = 0 So 4992-59-0 is a valid CAS Registry Number.