Abstract
Abstract We have conducted a sensitive 3 mm observation toward the shocked region, Lynds 1157 B1, which is an interaction spot between a molecular outflow and its ambient gas. We have successfully detected the CH$_3$CHO, HCOOCH$_3$, and HCOOH lines, as well as the CH$_2$DOH line. The abundances of these molecules relative to CH$_3$OH are found to be lower than those in the low-mass star-forming core, IRAS 16293$-$2422. Since these molecules are thought to evaporate from grain mantles, the observational results mean that complex molecules are less abundant in grain mantles residing in the ambient cloud surrounding a prestellar/protostellar core. Instead, efficient formation of the complex organic species and deuterated species should take place in a prestellar/protostellar core. The present result verifies the importance of an unbiased line survey of this source.
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