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189102-20-3

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189102-20-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 189102-20-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,9,1,0 and 2 respectively; the second part has 2 digits, 2 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 189102-20:
(8*1)+(7*8)+(6*9)+(5*1)+(4*0)+(3*2)+(2*2)+(1*0)=133
133 % 10 = 3
So 189102-20-3 is a valid CAS Registry Number.

189102-20-3Upstream product

189102-20-3Relevant articles and documents

Antiproliferative hybrid analogs of the hormone 1α,25-dihydroxyvitamin D3: Design, synthesis, and preliminary biological evaluation

Posner,Lee,White,Hutchings,Dai,Kachinski,Dolan,Kensler

, p. 3299 - 3314 (1997)

The combination of 10-12 kbar pressure plus Lewis acidic zinc dichloride promotes highly regioselective and stereoselective Diels-Alder cycloaddition between 3-bromo-2-pyrone, prepared in a new way, and unactivated terminal alkene 4-(tert-butyldimethylsiloxy)-1-butene. The conjugate base of A-ring allylic phosphine oxide 20 adds chemospecifically to the C-8 keto group of some C-8,C-24-diketones to form directly metabolically resistant 24-oxo analogs of 1α,25-dihydroxyvitamin D3 (calcitriol). Several of these new hybrid analogs are as efficacious in vitro as calcitriol at inhibiting growth of murine keratinocytes even at physiologically relevant 10-100 nanomolar concentrations.

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