30405
[ 3H ] S - desoxy - BTX - B2 ( cysteine brevetoxin B ) was semi - synthesized from BTX - B by conjugation of cysteine at the C50 olefinic group , then [ 3H ] radiolabeled by C42 aldehyde reduction .
 Chemical: [ 3H ] S - desoxy - BTX - B2; Chemical: cysteine brevetoxin B; Chemical: BTX - B; Chemical: cysteine; Chemical: olefinic; Chemical: [ 3H ]; Chemical: aldehyde
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: [ 3H ] S - desoxy - BTX - B2, cysteine brevetoxin B, BTX - B, cysteine, olefinic, [ 3H ], aldehyde 
Answer:
 Chemical: [ 3H ] S - desoxy - BTX - B2; Chemical: cysteine brevetoxin B; Chemical: BTX - B; Chemical: cysteine; Chemical: olefinic; Chemical: [ 3H ]; Chemical: aldehyde