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200571-81-9

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200571-81-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 200571-81-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,0,5,7 and 1 respectively; the second part has 2 digits, 8 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 200571-81:
(8*2)+(7*0)+(6*0)+(5*5)+(4*7)+(3*1)+(2*8)+(1*1)=89
89 % 10 = 9
So 200571-81-9 is a valid CAS Registry Number.

200571-81-9Relevant articles and documents

Solid-phase synthesis of 3,4-dihydroquinazoline

Wang, Fengjiang,Hauske, James R.

, p. 8651 - 8654 (1997)

A novel, facile and efficient method for the synthesis of aryl iminophosphorane has been developed by treating a series of Ar-NH2 (1) attached to a solid support with Ph3P and diethyl azodicarboxylate at room temperature. The resulting solid-supported cinnamyl iminophosphorane (4) was treated with an aryl isocyanate to generate the corresponding solid-supported carbodiimide (5), which upon exposure to a secondary amine underwent 1,2-addition followed by an intramolecular Michael addition to afford the desired 3,4-dihydroquinazoline (7).

Synthesis and SAR studies of a novel series of T-type calcium channel blockers

Park, Seong Jun,Park, Sung Jun,Lee, Min Joo,Rhim, Hyewhon,Kim, Yoonjee,Lee, Jung-Ha,Chung, Bong Young,Lee, Jae Yeol

, p. 3502 - 3511 (2007/10/03)

For the novel, potent, and selective T-type Ca2+ channel blockers, a series of sulfonamido-containing 3,4-dihydroquinazoline derivatives were prepared and evaluated for their blocking actions on T- and N-type Ca2+ channels. Among the

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