6817
His industrial sabbatical at  Imperial College  London with  Geoffrey Wilkinson  in 1960-61 introduced him to organometallic chemistry .
 employee of: Imperial College, Geoffrey Wilkinson
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
Answer:
 employee of: Imperial College, Geoffrey Wilkinson