本申请涉及含有式(i)化合物的大麻素受体配体，其中A、R 1、R2和R3如说明书中所定义。
The present application relates to cannabinoid receptor ligands containing compounds of formula (I) wherein a, R1, R2, and R3 are as defined in the specification.
许多哺乳动物的奶含有大麻素，这种物质可以刺激大脑中的某些受体。
The milk of many mammals contains cannabinoids, substances that are known to stimulate certain receptors in the brain.
为了研究大麻素的作用，研究人员给新生老鼠注射了一种化学物质，这种化学物质可以阻止大麻素到达它们大脑中的受体。
To investigate the function of cannabinoids, researchers injected newborn mice with a chemical that is known to block cannabinoides from reaching their receptors in the brain.
为了研究大麻素的作用，研究人员给新生老鼠注射了一种化学物质，这种化学物质可以阻止大麻素到达它们大脑中的受体。
To investigate the function of cannabinoids, researchers injected newborn mice with a chemical that is known to block cannabinoides from reaching their receptors in the brain.
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