The CAS Registry Mumber 92307-59-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,2,3,0 and 7 respectively; the second part has 2 digits, 5 and 9 respectively. Calculate Digit Verification of CAS Registry Number 92307-59: (7*9)+(6*2)+(5*3)+(4*0)+(3*7)+(2*5)+(1*9)=130 130 % 10 = 0 So 92307-59-0 is a valid CAS Registry Number.