The CAS Registry Mumber 1109-90-6 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,1,0 and 9 respectively; the second part has 2 digits, 9 and 0 respectively. Calculate Digit Verification of CAS Registry Number 1109-90: (6*1)+(5*1)+(4*0)+(3*9)+(2*9)+(1*0)=56 56 % 10 = 6 So 1109-90-6 is a valid CAS Registry Number.
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Get Best Price for1109-90-6Yohimban-17-ol, 18-(phenylmethylene)-, (17.beta.)-, (2Z)-2-butenedioate (1:1) (salt)