EINECS 249-924-8, 1,1-dimethoxy-4-chlorobutane, 4-chlorobutyraldehyde dimethyl acetal, chlorobutyraldehyde-dimethylacetal, 4-Chlorobutanal dimethyl acetal (for sumatriptan and other triptans), 1-Chloro-4,4-dimethoxybutane, 4-Chlorobutanaldimethylacetal, 4-Chlorobutanal dimethyl acetal