11524
Density functional theory was applied to study the interaction of group IIb transition - metal cations ( Zn ( 2 + ) , Cd ( 2 + ) , and Hg ( 2 + ) ) with one and two fully or partially deprotonated 3 - mercaptopropionic acid ligands .
 Chemical: group IIb transition - metal; Chemical: Zn ( 2 + ); Chemical: Cd ( 2 + ); Chemical: Hg ( 2 + ); Chemical: 3 - mercaptopropionic acid
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: group IIb transition - metal; Chemical: Zn ( 2 + ); Chemical: Cd ( 2 + ); Chemical: Hg ( 2 + ); Chemical: 3 - mercaptopropionic acid