Viridenomycin, shown below, is a polyene antibiotic that displays anti-tumor activity. Its structural complexity and chemical instability have made it a challenging target for organic chemists to synthesize. Ignoring the benzene ring, circle any trisubstituted alkene(s), and put a box around any Z alkene(s). 
Definitions:
Geophysical Survey
A geophysical survey involves the systematic collection of geophysical data for spatial studies to detect or infer the properties and structures of Earth's subsurface.
Magnetism Measurements
The process of quantifying the strength and direction of the magnetic field at various points on the Earth's surface or in materials.
Gravity Variation
Differences in gravitational force measured across the Earth's surface, caused by variations in the density of underlying rocks and materials.
Contour Map
A map marked with lines that represent equal elevation points, used to show the shape and elevation of land surfaces.
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