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The first laboratories to complete the total synthesis from much less complex starting materials were the research groups of Robert A. Holton , who had the first article to be accepted for publication , and of K. C. Nicolaou who had the first article to appear in print ( by a week , on 7 February 1994 ) .
 Robert A. Holton, K. C. Nicolaou
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Text: {0} 
Answer:
 Robert A. Holton, K. C. Nicolaou