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是因?yàn)榭吹揭淮蠖蔚挠⑽亩鴽]人回么? 請(qǐng)就看這3句: 化合物17、29的 Modification of the amino substituent gave the isomeric tetramethyl derivative 17 and the 4,7-dihydroindanyl indacaterol derivative 29 which had comparable decreases in affinity and selectivity when compared to 1. 化合物16的 Introduction of the a-methyl group into the amino substituent gave the analogue 25 which led to the anticipated increase in b2adrenoceptor affinity, of greater than 10-fold relative to 1.However, this increase in affinity was also accompanied by an even greater relative increase in b1-adrenoceptor affinity and an overall reduction in binding selectivity. 謝謝!! |
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