28159
Scrophularianines A - C ( 1 - 3 ) , three new unusual monoterpene pyridine alkaloids with cyclopenta [ c ] pyridine skeleton reported from the genus Scrophularia for the first time , together with 15 known compounds ( 4 - 18 ) , were isolated from the extract of Scrophularia ningpoensis .
 Scrophularianines A - C, monoterpene pyridine alkaloids, cyclopenta [ c ] pyridine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Scrophularianines A - C, monoterpene pyridine alkaloids, cyclopenta [ c ] pyridine