2670
A broad variety of ligands was employed , affording novel and previously inaccessible cycloheptatrienyl ( sandwich ) complexes of the type [ ( eta ( 7 ) - C ( 7 ) H ( 7 ) ) Zr ( Y ) ] ; Y comprises pentadienyl , cyclopentadienyl , allyl , phospholyl , boratabenzene , imidazolin - 2 - iminato and amido systems .
 Chemical: cycloheptatrienyl; Chemical: ( eta ( 7 ) - C ( 7 ) H ( 7 ) ) Zr ( Y ); Chemical: pentadienyl; Chemical: cyclopentadienyl; Chemical: allyl; Chemical: phospholyl; Chemical: boratabenzene; Chemical: imidazolin - 2 - iminato; Chemical: amido
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: cycloheptatrienyl; Chemical: ( eta ( 7 ) - C ( 7 ) H ( 7 ) ) Zr ( Y ); Chemical: pentadienyl; Chemical: cyclopentadienyl; Chemical: allyl; Chemical: phospholyl; Chemical: boratabenzene; Chemical: imidazolin - 2 - iminato; Chemical: amido