Synthetics
Ethyl vanillin propylene glycol acetal smells like a vanilla-like compound with a slightly sweet, almost candy-like aroma.
Mosciano, Gerard P&F 25, No. 1, 49, (2000): Sweet sharp vanillin, creamy with spicy clove-like nuances
Luebke, William tgsc, (1989): Sweet vanilla creamy spicy
Bedoukian Research: A vanilla odor with a spicy, clove like undertone
Used as a replacement for ethyl vanillin; stable in alkali, little discoloration.