19130
Remarkably , the formation of six stereocenters and the regiospecific formation of six rings in A - 74528 appear to be catalyzed by only two tailoring enzymes , a cyclase and an oxygenase , in addition to the core polyketide synthase .
 Chemical: A - 74528
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: A - 74528 
Answer:
 Chemical: A - 74528