The CAS Registry Mumber 90598-46-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,0,5,9 and 8 respectively; the second part has 2 digits, 4 and 6 respectively. Calculate Digit Verification of CAS Registry Number 90598-46: (7*9)+(6*0)+(5*5)+(4*9)+(3*8)+(2*4)+(1*6)=162 162 % 10 = 2 So 90598-46-2 is a valid CAS Registry Number.