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Tadalafil is an annulated 2,5-diketopiperazine. [25] It is also a 1,2,3,4-tetrahydro-β-carboline. Tadalafil can be synthesized starting from (D)-tryptophan methyl ester and piperonal via a Pictet–Spengler reaction. This is followed by condensations with chloroacetyl chloride and methylamine to complete the diketopiperazine ring: [26]
Team USA Submitted an Appeal. The U.S. Olympic & Paralympic Committee issued an additional statement on Sunday, saying, “We firmly believe that Jordan rightfully earned the bronze medal, and ...
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2024 Democratic Party presidential primaries. From January 23 to June 8, 2024, presidential primaries and caucuses were organized by the Democratic Party to select the delegates to the 2024 Democratic National Convention, to determine the party's nominee for president in the 2024 United States presidential election.
The Treaty of Versailles was an important step in the status of the British Dominions under international law. Australia, Canada, New Zealand and South Africa had each made significant contributions to the British war effort, but as separate countries, rather than as British colonies.
Besides Tebogo, the top challengers to Lyles in the 200 final Thursday night could be his fellow Americans. Kenny Bednarek, the 2021 Olympic silver medalist in the 200, won Wednesday night’s ...
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