9935
These two families of guanidine alkaloids clearly showed a structure - activity relationship with the crambescins acting on voltage - gated potassium channels , while Cramb816 blocks the voltage - gated calcium channel Cav1 with higher potency than nifedipine .
 Chemical: guanidine alkaloids; Chemical: crambescins; Chemical: potassium; Chemical: Cramb816; Chemical: calcium; Chemical: nifedipine
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: guanidine alkaloids; Chemical: crambescins; Chemical: potassium; Chemical: Cramb816; Chemical: calcium; Chemical: nifedipine