30508
Eight new metabolites with regio - and stereo - selective introduction of hydroxyl and lactone groups at various inert carbon positions were obtained .
 Chemical: hydroxyl; Chemical: lactone; Chemical: carbon
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: hydroxyl; Chemical: lactone; Chemical: carbon