β-Phenethanolamines of the following formula are effective in promoting growth and improving feed efficiency and leanness in animals:
wherein:
R1 is hoydrogen, hydroxy, or methoxy;
R2 is hydrogen or fluoro;
R3 is hydrogen or C1-C2 alkyl;
R4 is hydrogen or methyl;
R5 is hydrogen, fluoro, nitro, hydroxy, SO2CH3 or CONH2; provided that R1 is hydrogen only when R5 is nitro or SO2CH3; or an acid addition salt thereof.
下式中β-
苯乙醇胺可有效促进动物生长,提高饲料效率和瘦肉率:
其中
R1 是氢,羟基或甲氧基;
R2 是氢或
氟
R3 是氢或 C1-C2 烷基
R4 是氢或甲基
R5 是氢、
氟、硝基、羟基、SO2CH3 或 CONH2;但只有当 R5 是硝基或 SO2CH3 时,R1 才是氢;或其酸加成盐。