لَا طَالِبَ عِلْمٍ مُهْمِلٌ
Translation: No seeker of knowledge is negligent.
لَا: generic-negating particle.
طَالِبَ: accusative ism lā with visible fatḥ, because it is muḍāf (thus inflected, not built as the non-muḍāf singular).
عِلْمٍ: genitive muḍāf ilayh.
مُهْمِلٌ: nominative khabar lā.
This is an added teaching example to prevent overgeneralizing the rule for the simple, non-construct ism.