Silvial

Say itSIL-vee-al

Bright, watery lily of the valley with a zesty aldehydic sparkle.

What it is: A molecule made in a lab, first made by Rhône-Poulenc in 1964.
When you smell it: Heart: the first hours.
What perfumers do with it: A go-to Lilial and Lyral substitute that gives muguet accords power and freshness.
Worth knowing: It differs from Lilial only in the shape of one four-carbon side chain: isobutyl instead of tert-butyl.
Rules: Limited. IFRA limits since 49th Amendment: sensitization, systemic toxicity
Also called: Suzaral; 3-(4-isobutylphenyl)-2-methylpropanal; cyclamen homoaldehyde

Not on the label of any of the 232 perfumes read so far.

Sources