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156207-52-2

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156207-52-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 156207-52-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,6,2,0 and 7 respectively; the second part has 2 digits, 5 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 156207-52:
(8*1)+(7*5)+(6*6)+(5*2)+(4*0)+(3*7)+(2*5)+(1*2)=122
122 % 10 = 2
So 156207-52-2 is a valid CAS Registry Number.

156207-52-2Relevant articles and documents

SYNTHESIS OF SOME EPITESTOSTERONE ANALOGUES

Chodounska, Hana,Slavikova, Barbora,Kasal, Alexander

, p. 435 - 443 (1994)

11β-Hydroxyandrost-4-ene-3,17-dione (III) was converted into a potential metabolite of epitestosterone - 11β,17α-dihydroxyandrost-4-en-3-one (II) in 5 steps, including the inversion of configuration of a 17β-hydroxy group.This inversion was not feasible in the preparation of the analogues X, XIV, XX, and XXII, where the 17α-hydroxy group was introduced first and only then was the rest of molecule modified.

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