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The elongated structures of polyamine inverse agonists such as 1 , 12 - diaminododecane ( N12N ) and 5 - ( 4 - aminobutyl ) - 2 - thiopheneoctanamine ( N4T8N ) lend themselves to a combinatorial chemistry approach to explore a potential polyamine pharmacophore at the NMDA receptor .
 Chemical: polyamine; Chemical: 1 , 12 - diaminododecane; Chemical: N12N; Chemical: 5 - ( 4 - aminobutyl ) - 2 - thiopheneoctanamine; Chemical: N4T8N; Chemical: polyamine; Chemical: NMDA
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: polyamine; Chemical: 1 , 12 - diaminododecane; Chemical: N12N; Chemical: 5 - ( 4 - aminobutyl ) - 2 - thiopheneoctanamine; Chemical: N4T8N; Chemical: polyamine; Chemical: NMDA