Improve the following subject lines:1) Bad subject line: BrochureGood subject line: This email is from a travel agent to a client who has asked for brochures on cruises in the Caribbean.
【简答题】甲氧苄氨嘧啶生产中由没食子酸(名称: 3,4,5- 三羟基苯甲酸,分子式: C 7 H 6 O 5 ,摩尔质量: 170 g/mol )经甲基化反应制备三甲氧苯甲酸( C 10 H 12 O 5 , 摩尔质量: 212 g/mol )工序,测得投料量没食子酸 25.0kg ,未反应的没食子酸 2.0kg ,生成三甲氧苯甲酸 24.0kg ,试求转化率、选择性和收率。