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111761-70-7

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111761-70-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 111761-70-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,1,7,6 and 1 respectively; the second part has 2 digits, 7 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 111761-70:
(8*1)+(7*1)+(6*1)+(5*7)+(4*6)+(3*1)+(2*7)+(1*0)=97
97 % 10 = 7
So 111761-70-7 is a valid CAS Registry Number.

111761-70-7Relevant articles and documents

Spirocyclic Penicillins

Burton, George,Harrington, Frank P.

, p. 635 - 638 (2007/10/02)

The intramolecular, mercury-mediated cyclisation of (6S)-benzyl 6--6-(methylthio)penicillinates, (8) and (9), has been shown to give spiro derivatives.Unexpectedly, products (16) and (17), derived from attack on the more-hindered β-face, were isolated in addition to the predicted products (10) and (11), formed by attack on the α-face.Formylation and removal of the carboxy protecting group gave spirocyclic penicillins devoid of useful antibacterial activity.

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