β receptor agonists HO -CHCH2-NH2 NOREPINEPHRINE non-selectivity HO OH 去甲肾上腺素 HO CH-CH2NH EPINEPHRINE 肾上腺素 HO OH CHa CHCH2-NH ISOPROTERENOL HO OH 异丙肾上腺素 CH(CHak JOH2C ALBUTEROLOL H-CH2-NH o B2 receptor selective agonists HO HOH2C CH-CH2NHCH2 (CH)s-OCH2( CH2)3 SALMETEROL 沙丁胺醇 HO FORMOTEROL HCONH FCH2NHCH-CH2 OCH3 福莫特罗 HO receptor agonists 去甲肾上腺素 异丙肾上腺素 沙丁胺醇 福莫特罗 肾上腺素 non-selectivity 2 receptor selective agonists