Limonoic acid A-ring lactone 柠檬苦素酸单内酯
Acid graphite seal ring 耐酸碱石墨密封环
Precision acid graphite seal ring 精密耐酸石墨密封环
Polylactic acid (PLA) is a linear aliphatic polyester produced by poly-condensation of naturally produced lactic acid or by the catalytic ring opening of the lactide group.
聚乳酸(PLA)是一种线性脂肪族聚酯的聚乳酸中自然产生的或由丙交酯开环缩合催化剂组产生。
Low acid value resins were synthesized by E10 with low temperature ring opening.
采用E10低温开环酯化合成低酸值树脂。
The five quinazoline compounds were prepared by using 2 amino 4,5 dimethoxy benzoic acid as original material, which underwent ring closing, halogenation and substitution.
方法：以2 氨基4 ，5 二甲氧基苯甲酸为原料，分别经过环化、氯代、取代等反应，合成了五种目标化合物。
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