Synthetics
Citral dimethyl acetal (iff) smells like a bright, fresh citrus with a prominent lemon note.
Mosciano, Gerard P&F 17, No. 5, 127, (1992): Harsh green, citrus lemon-lime like with an aldehydic terpy nuance
Luebke, William tgsc, (1996): Green floral citric lemon lime natural
IFF: Citrus, verbena note. has a much milder but more natural lemon odor than citral
Moellhausen: Fresh citrusy; lemon-like, more natural lemon than citral