6442
Their electron impact mass spectra are compatible with 16 - hydroxylated steroids O - TMS derivatives presenting diagnostic ions such as m / z 231 and m / z 218 .
 Chemical: 16 - hydroxylated steroids O - TMS
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: 16 - hydroxylated steroids O - TMS