polymethine

例句：

1. 1.This compound is used in the production of polymethylamine.
   这种化合物用于生产聚甲基胺。
2. 2. Polymethylamine is a common chemical used in the manufacturing of plastics.
   聚甲基胺是一种常见的化学原料，用于制造塑料。
3. 3. The polymethylamine reacts with water to form methyl alcohol and ammonium hydroxide.
   聚甲基胺与水反应生成甲醇和氨水。