The chiral centers in Pumiliotoxin 251D can produce several stereoisomers of the compound : only one form of toxin is present in nature and has toxic properties . The chiral centers in pumiliotoxin 251D can give several stereoisomers of the compound . Only one form of the toxin is present in nature and has toxic properties . The chiral centers in pumiliotoxin 251D can give toxic stereoisomers of the compound . Only one form of the toxin is present in nature and has several properties .