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165281-40-3

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165281-40-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 165281-40-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,6,5,2,8 and 1 respectively; the second part has 2 digits, 4 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 165281-40:
(8*1)+(7*6)+(6*5)+(5*2)+(4*8)+(3*1)+(2*4)+(1*0)=133
133 % 10 = 3
So 165281-40-3 is a valid CAS Registry Number.

165281-40-3Upstream product

165281-40-3Relevant articles and documents

Transformed steroids 195. Introduction of the 9α-hydroxygroup into Δ5-3β-hydroxysteroids by Circinella sp. mold

Voishvillo, N. E.,Istomina, Z. I.,Kamernitsky, A. V.

, p. 689 - 695 (2007/10/02)

A preparative method of 9α-hydroxylation of Δ5-3β-hydroxysteroids using the fungi of Circinella sp.IOKh-1220 not capable of modifying the ring A has been developed.It is established that the yields of the main and the side products greatly depend on the transformation conditions, mycelium age, and the structure of the steroid substrate.Under the optimal transformation conditions novel 9α-hydroxysubstituted derivatives of androstenolone, pregnenolone, 16-dehydro-16α,17α-epoxy-, and 16α-methoxypregnenolone have been obtained in 36-80percent yields. - Key words: hydroxylation, Δ5-3β-hydroxysteroids, Δ5-3β,9α-dihydroxysteroids, Circinella sp.

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