α-(trimethylsilylmethyl)divinyl ketone

1-(三甲基硅氧基)环戊烯

1,2-diaza-spiro[2.5]oct-1-en-4-one

2-氧代环戊烷羧酸甲酯

1,4-dioxa-spiro[4.4]nonane-6-carboxylic acid methyl ester