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[求助] 苄泽类表面活性剂型号中的数字代表什么意思及分子式

请问苄泽类表面活性剂型号中的数字代表什么意思呢?如苄泽56,苄泽78等中的56和78代表什么呢?还有各苄泽的分子式是什么呢?如苄泽58为聚氧乙烯(20)鲸蜡醇醚,其分子式为C16H33(OCH2CH2)20OH,忘虫友们能帮我补充其他型号苄泽类表面活性剂这方面的信息,不甚感激哈
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