16943
An investigation begun in 1979 directed at the Republic of Palau marine sponge Agelas axifera Hentschel for cancer cell growth inhibitory constituents subsequently led to the isolation of three new pyrimidine diterpenes designated axistatins 1 ( 1 ) , 2 ( 2 ) , and 3 ( 3 ) , together with the previously reported formamides 4 , 5 , and agelasine F ( 6 ) .
 pyrimidine, diterpenes, axistatins 1 ( 1 ) , 2 ( 2 ) , and 3 ( 3 ), formamides, agelasine F
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 pyrimidine, diterpenes, axistatins 1 ( 1 ) , 2 ( 2 ) , and 3 ( 3 ), formamides, agelasine F