csv一般是纯文本数据,方便被多种程序读取。其他程序直接读取EXCEL的数据可能不太方便。
(维基)"The Unique Ingredient Identifier (UNII) is a non-proprietary, free, unique, unambiguous, non-semantic, alphanumeric identifier linked to a substance's molecular structure or descriptive information by the Substance Registration System (SRS) of the Food and Drug Administration (FDA) and the United States Pharmacopeia (USP).