Cas 897664-75-4,3-benzyloxy-16-ethynyl-17-(benzothien-2'-yl)-estra-1,3,5<sup>(10)</sup>,16-tetraene

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Check Digit Verification of cas no

The CAS Registry Mumber 897664-75-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,9,7,6,6 and 4 respectively; the second part has 2 digits, 7 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 897664-75:
(8*8)+(7*9)+(6*7)+(5*6)+(4*6)+(3*4)+(2*7)+(1*5)=254
254 % 10 = 4
So 897664-75-4 is a valid CAS Registry Number.

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897664-75-4Relevant academic research and scientific papers

Benzothieno and benzofurano annelated estranes

Watanabe, Masataka,Mataka, Shuntaro,Thiemann, Thies

, p. 856 - 866 (2007/10/03)

The preparation of estrone derived benzothieno- and benzofurano fused steroids is described. Keystep is an intramolecular thienyl(/furyl)-ene-yne cyclization of 16-ethynyl-17-heterarylestra-1,3,5(10),16-tetraenes. The cyclization was carried out under Pt as well as under Ru catalysis.

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