19995
In all the crystal structures of complexes 1 - 6 , the platinum centre adopts an approximately square - planar geometry , which were found to possess excellent solubility in both organic solvents and water and exhibit considerable cytotoxicity against MG - 63 , SK - OV - 3 and HepG2 cell lines , but low cytotoxicity towards normal human liver cell HL - 7702 .
 Chemical: platinum
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: platinum