Cas 203173-70-0,(20S)-7-tert-butyldimethylsilylcamptothecin

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Check Digit Verification of cas no

The CAS Registry Mumber 203173-70-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,3,1,7 and 3 respectively; the second part has 2 digits, 7 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 203173-70:
(8*2)+(7*0)+(6*3)+(5*1)+(4*7)+(3*3)+(2*7)+(1*0)=90
90 % 10 = 0
So 203173-70-0 is a valid CAS Registry Number.

203173-70-0Upstream product

203173-70-0Downstream Products

220913-32-6 DB-67

203173-70-0Relevant articles and documents

Semisynthesis of DB-67 and other silatecans from camptothecin by thiol-promoted addition of silyl radicals

Du, Wu,Kaskar, Bashir,Blumbergs, Peter,Subramanian,Curran, Dennis P.

, p. 451 - 458 (2007/10/03)

Thiol- or acid-promoted additions of silyl radicals to camptothecin are reported. At 105°C, mixtures of 7-silyl (favored) and 12-silyl camptothecins are formed alongside substantial amounts of recovered camptothecin. At 160°C, 12-silyl isomers are formed

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203173-70-0