Allenes are compounds with adjacent carbon-carbon double bonds. Many allenes are chiral, even though they don't contain chirality centers. Mycomycin, for example, a naturally occurring antibiotic isolated from the bacterium Nocardia acidophilus, is chiral and has $[\alpha]_{\mathrm{D}}=-130 .$ Explain why mycomycin is chiral.
$$\mathrm{HC} \equiv \mathrm{C}-\mathrm{C} \equiv \mathrm{C}-\mathrm{CH}=\mathrm{C}=\mathrm{CH}-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}_{2} \mathrm{CO}_{2} \mathrm{H}$$