157636-33-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 157636-33-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,7,6,3 and 6 respectively; the second part has 2 digits, 3 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 157636-33:
(8*1)+(7*5)+(6*7)+(5*6)+(4*3)+(3*6)+(2*3)+(1*3)=154
154 % 10 = 4
So 157636-33-4 is a valid CAS Registry Number.
157636-33-4Relevant articles and documents
Some reactions of 16α,17α-oxido-5α-cholestane derivatives, synthesis of 17α-hydroxycholest-4-en-3-one
Velgova, Helena,Kasal, Alexander,Budinsky, Milo
, p. 335 - 340 (1994)
Careful epoxidation of the Δ16-olefins 3 and 4 yielded 16α,17α- epoxides 5 and 6 which were reduced by lithium aluminium hydride, oxidized, and dehydrated to 17α-hydroxycholest-4-en-3-one 20, i.e., an epitestosterone homolog containing a well t
