中间体2-Picolinicacidethylester2-***甲酸乙酯2524-52-9≥98%Ethylpicolinate浅***液体中间体3-Picolinicacidethylester3-***甲酸乙酯614-18-6≥98%中间体4-Picolinicacidethylester4-***甲酸乙酯1570-45-2≥98%Ethylisonicotinate中间体2-Pyridinemethanol2-******586-98-1≥98%中间体3-Pyridinemethanol3-******100-55-0≥98%中间体4-Pyridinemethanol4-******586-95-8≥98%中间体2-Pyridinecarboxaldehyde2-***甲醛1121-60-4≥98%中间体3-Pyridinecarboxaldehyde3-***甲醛500-22-1≥98%液体中间体4-Pyridinecarboxaldehyde4-***甲醛872-85-5≥98%黄棕色液体)