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120730-51-0

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120730-51-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 120730-51-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,0,7,3 and 0 respectively; the second part has 2 digits, 5 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 120730-51:
(8*1)+(7*2)+(6*0)+(5*7)+(4*3)+(3*0)+(2*5)+(1*1)=80
80 % 10 = 0
So 120730-51-0 is a valid CAS Registry Number.

120730-51-0Relevant articles and documents

Chemical modification of an antitumor alkaloid, 20(S)-camptothecin: E-lactone ring-modified water-soluble derivatives of 7-ethylcamptothecin

Sawada,Yaegashi,Furuta,Yokokura,Miyasaka

, p. 310 - 313 (2007/10/02)

7-Ethylcamptothecin (1d), a model which does not have any site on the A-ring for further modification was converted into water-soluble derivatives by opening the E-ring lactone. 1d was heated in N,N-dimethylenediamine to yield amide 2a, and this was then acylated to furnish 3a-q, which were soluble in water as their HCl salts. The propionyl (3b), butyryl (3c) and methylthiopropionyl (3h) derivatives showed higher activity than the sodium salt of 1d. The acyl group makes the derivatives more lipophilic, and ease of hydrolysis of amide 2a to 1d is thought to be necessary for significant activity.

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