138721-52-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 138721-52-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,8,7,2 and 1 respectively; the second part has 2 digits, 5 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 138721-52:
(8*1)+(7*3)+(6*8)+(5*7)+(4*2)+(3*1)+(2*5)+(1*2)=135
135 % 10 = 5
So 138721-52-5 is a valid CAS Registry Number.
138721-52-5Relevant articles and documents
Tertiary butyl 4,4-bis(4′-hydroxyphenyl) pentanoate derivatives and positive resist materials containing the same
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Page column 11-12, (2010/02/05)
Disclosed are novel tert-butyl 4,4-bis(4′-hydroxyphenyl)pentanoate derivatives represented by the following general formula (I); wherein R1represents a protective group which can be readily eliminated under an acidic condition, and R2/sup