Soursop oil (Annona muricata, Annonaceae) produces natural acetogenins in its leaf, stem, bark and fruit seed, which have demonstrated, in addition to significant anti-tumor and anti-cancer properties, selective toxicity against various types of cancer cells (without damaging healthy cells).

Annona muricata is a small, upright, evergreen tree that can grow to about 30 feet (9.1 m) tall. Its young branches are hairy. Leaves are oblong to oval, 8 centimetres (3.1 in) to 16 centimetres (6.3 in) long and 3 centimetres (1.2 in) to 7 centimetres (2.8 in) wide. They are a glossy dark green with no hairs above, and paler and minutely hairy to no hairs below.

The leaf stalks are 4 millimetres (0.16 in) to 13 millimetres (0.51 in) long and without hairs. Flower stalks (peduncles) are 2 millimetres (0.079 in) to 5 millimetres (0.20 in) long and woody. They appear opposite from the leaves or as an extra from near the leaf stalk, each with one or two flowers, occasionally a third.

Stalks for the individual flowers (pedicels) are stout and woody, minutely hairy to hairless and 15 millimetres (0.59 in) to 20 millimetres (0.79 in) with small bractlets nearer to the base which are densely hairy.

The petals are thick and yellowish. Outer petals meet at the edges without overlapping and are broadly ovate, 2.8 centimetres (1.1 in) to 3.3 centimetres (1.3 in) by 2.1 centimetres (0.83 in) to 2.5 centimetres (0.98 in), tapering to a point with a heart shaped base.