The CAS Registry Mumber 157723-26-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,7,7,2 and 3 respectively; the second part has 2 digits, 2 and 6 respectively. Calculate Digit Verification of CAS Registry Number 157723-26: (8*1)+(7*5)+(6*7)+(5*7)+(4*2)+(3*3)+(2*2)+(1*6)=147 147 % 10 = 7 So 157723-26-7 is a valid CAS Registry Number.
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Aldrich
(480290) Poly(dimethylsiloxane),monoglycidyletherterminated average Mn ~5,000