12784
Two new glycosides , 2 - methyl pyromeconic acid 3 - O - beta - d - glucopyranoside - 6 ' - ( O - 4 '' - hydroxybenzoate ) ( 1 ) , 6 ' - O - p - hydroxybenzoyl - gardoside ( 2 ) and four known iridoid glycosides ( 3 - 6 ) were isolated from the whole plant of Vitex negundo .
 Chemical: 2 - methyl pyromeconic acid 3 - O - beta - d - glucopyranoside - 6 ' - ( O - 4 '' - hydroxybenzoate ); Chemical: 6 ' - O - p - hydroxybenzoyl - gardoside; Chemical: iridoid glycosides
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: 2 - methyl pyromeconic acid 3 - O - beta - d - glucopyranoside - 6 ' - ( O - 4 '' - hydroxybenzoate ); Chemical: 6 ' - O - p - hydroxybenzoyl - gardoside; Chemical: iridoid glycosides