Ff schemas.workflow.amber.v18.ff.Amber18Forcefield ¶ Bases: ForcefieldSchemaBase protein = Field(default=None) class-attribute instance-attribute ¶ Options for protein force fields. ff14SB ff99SB ff15ipq fb15 ff03ua water = Field(default=None) class-attribute instance-attribute ¶ Options for water force fields.