Promethazine hydrochloride, a phenothiazine derivative, is chemically designated as (Â±)-10-[2-(Dimethylamino)propyl] phenothiazine monohydrochloride. Promethazine hydrochloride occurs as a white to faint yellow, practically odorless, crystalline powder which slowly oxidizes and turns blue on prolonged exposure to air.
Confidence votes 11. The new Republic of China fell into chaos after 1912 because of the mistakes of Yuan Shikai. In 1912, after Sun Yixian(AKA Sun Yat-Sen) stepped down as president in favor for him, Yuan Shikai tried to foolishly create another dynasty.However, the military didn't back him and opposition divided the nation.ventually, the KMT retreated o the island of Taiwan and the CPC became the People's Republic of China (PRC) in 1949. There was never a peace agreement between both nations so both governments claim to be the legitimate government of all of China.
Fall of the Qing Dynasty. The Boxer Rebellion weakened the Qing dynasty, which was the last imperial dynasty of China and ruled the country from 1644 to 1912. It was this dynasty that established the modern territory of China. The diminished state of the Qing dynasty after the Boxer Rebellion opened the door to the Republican Revolution of 1911 that overthrew the emperor and made China a republic. The Republic of China, including mainland China and Taiwan, existed from 1912 to 1949.