1540-28-9 Ethyl .alpha.-propylacetoacetate Ethyl 2-acetylpentanoate Ethyl 2-acetylvalerate Ethyl 2-propylacetoacetate Ethyl propylacetoacetate NSC67958 Pentanoic acid, 2-acetyl-, ethyl ester Valeric acid, 2-acetyl-, ethyl ester