23282
Nitric oxide could be involved in the acquisition and maintenance of behavioral cocaine effects , probably by activation of neuronal nitric oxide synthase ( nNOS ) / NO / soluble guanylyl cyclase ( sGC ) / cyclic guanosine monophosphate ( cGMP ) signaling pathway , since inhibition of the nNOS enzyme attenuates development of sensitization in rats .
 Chemical: Nitric oxide; Chemical: cocaine; Chemical: nitric oxide; Chemical: NO; Chemical: guanylyl; Chemical: cyclic guanosine monophosphate; Chemical: cGMP
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: Nitric oxide; Chemical: cocaine; Chemical: nitric oxide; Chemical: NO; Chemical: guanylyl; Chemical: cyclic guanosine monophosphate; Chemical: cGMP